21=2a+(5+a)+a

Simple and best practice solution for 21=2a+(5+a)+a equation. Check how easy it is, and learn it for the future. Our solution is simple, and easy to understand, so don`t hesitate to use it as a solution of your homework.

If it's not what You are looking for type in the equation solver your own equation and let us solve it.

Solution for 21=2a+(5+a)+a equation:


Simplifying
21 = 2a + (5 + a) + a

Remove parenthesis around (5 + a)
21 = 2a + 5 + a + a

Reorder the terms:
21 = 5 + 2a + a + a

Combine like terms: 2a + a = 3a
21 = 5 + 3a + a

Combine like terms: 3a + a = 4a
21 = 5 + 4a

Solving
21 = 5 + 4a

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Add '-4a' to each side of the equation.
21 + -4a = 5 + 4a + -4a

Combine like terms: 4a + -4a = 0
21 + -4a = 5 + 0
21 + -4a = 5

Add '-21' to each side of the equation.
21 + -21 + -4a = 5 + -21

Combine like terms: 21 + -21 = 0
0 + -4a = 5 + -21
-4a = 5 + -21

Combine like terms: 5 + -21 = -16
-4a = -16

Divide each side by '-4'.
a = 4

Simplifying
a = 4

See similar equations:

| 8x+26=5x+14 | | -44x-2=12-9x | | 21+8x=2+7x | | 8x+17=9x+29 | | 7-2x=8-3x | | 2x+12=-54-9x | | 6x=18x+6 | | 7+2x=8+3x | | 21=2a+(5+a) | | 5x+8y+2=0 | | 21+3x=18+2x | | -6x-7=-31 | | 7x+17=9x+29 | | 18+4x=7x-5 | | X^4-2x^3-7x^2-2x-8=0 | | -19-3n=82 | | 30+2x=6x-3 | | x^2+35=-12x | | x^2+12=8x | | 3x^2+10=0 | | 8x^2=-32x | | 25x^2-20x+16= | | 34+2x=5x-2 | | 121-7x=11x+15 | | 2x^2=24x-70 | | 14x+9=7x+34 | | 2-x=3x-14 | | 13x=7x+6 | | x^2-7=6x | | -5x-7=0 | | x^2=-7x | | -4x^7-8x^6+12x^5=0 |

Equations solver categories