7a-15=a+21

Simple and best practice solution for 7a-15=a+21 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 7a-15=a+21 equation:


Simplifying
7a + -15 = a + 21

Reorder the terms:
-15 + 7a = a + 21

Reorder the terms:
-15 + 7a = 21 + a

Solving
-15 + 7a = 21 + a

Solving for variable 'a'.

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

Add '-1a' to each side of the equation.
-15 + 7a + -1a = 21 + a + -1a

Combine like terms: 7a + -1a = 6a
-15 + 6a = 21 + a + -1a

Combine like terms: a + -1a = 0
-15 + 6a = 21 + 0
-15 + 6a = 21

Add '15' to each side of the equation.
-15 + 15 + 6a = 21 + 15

Combine like terms: -15 + 15 = 0
0 + 6a = 21 + 15
6a = 21 + 15

Combine like terms: 21 + 15 = 36
6a = 36

Divide each side by '6'.
a = 6

Simplifying
a = 6

See similar equations:

| 22+10y=6y+26 | | x-6+4=-3-2 | | -4x-4y=-8 | | 9=n+5 | | 3y+6=55-4y | | 2x-7=x+5 | | 4k+8=20+k | | 10-7=3 | | 57-5x=7-9x | | -x+3y=-7 | | 3-5=a-4 | | 4h+5=2h+15 | | 7x^2+58x-45=0 | | 3x+4=2x+1 | | 2x+5y=3 | | n^2=-3n | | x-y=-13 | | 3+4x=30+x | | x=-3+-0.67y | | 2x+15=x+10 | | 2x=200 | | 3w+1=11-2w | | 4x^2-7x+10=4x+3 | | 4x+21=10x+3 | | (5x^2)-x-18=0 | | 5(y+2)=4y | | 7(6y-2)=28y | | 20+8r=-4+5r | | 7a-5=2a+20 | | 7(6x-2)=28y | | -9+13g=11-g | | 6p+6-6(p+1)=-(3p+7) |

Equations solver categories