3a+21=7-4a

Simple and best practice solution for 3a+21=7-4a 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 3a+21=7-4a equation:


Simplifying
3a + 21 = 7 + -4a

Reorder the terms:
21 + 3a = 7 + -4a

Solving
21 + 3a = 7 + -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 + 3a + 4a = 7 + -4a + 4a

Combine like terms: 3a + 4a = 7a
21 + 7a = 7 + -4a + 4a

Combine like terms: -4a + 4a = 0
21 + 7a = 7 + 0
21 + 7a = 7

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

Combine like terms: 21 + -21 = 0
0 + 7a = 7 + -21
7a = 7 + -21

Combine like terms: 7 + -21 = -14
7a = -14

Divide each side by '7'.
a = -2

Simplifying
a = -2

See similar equations:

| (3x+1)*(x)=30 | | 4x^2-64=0 | | -24=-4x-6-2 | | 9x+65=-4x | | x-3(x-1)-2+3(x-1)=0 | | 11+5d-d-4=7 | | 2(a+7)-7=9 | | 1+3p-6p=22 | | C(Q)=20+3Q^2 | | 8n=46 | | 4x+3=4x+3 | | x^2+6x+2.25=4.25 | | X+y+x=2y-8 | | 2d-4-4=5 | | 2x^2-3x+5=0 | | 3(y-2)=6(y-1)-3y | | x^2+6x+4=0 | | 5x-y=-16 | | 2x*2x=36 | | 2x+4(3x-8)= | | 3(2x^2)=36 | | 7x=90 | | 7=9 | | 2+4(3x-8)= | | 3x=5x+2 | | 2x^2=36 | | 10=4x+8-2x | | -20+-20= | | 4x-2(12-x)=18 | | 7v-16=7v+8v | | 4x^2+4x-24=0 | | 8=4+(r+4) |

Equations solver categories