21-a=2a

Simple and best practice solution for 21-a=2a 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-a=2a equation: 



21-a=2a

We move all terms to the left:

21-a-(2a)=0

We add all the numbers together, and all the variables

-3a+21=0

We move all terms containing a to the left, all other terms to the right

-3a=-21

a=-21/-3

a=+7

See similar equations:

| .02=(x-(125.7*1.33))/x | | 2/3 =z/15​ | | 2(x-12)=78 | | y-12=-60 | | x/(26-x)=2/11 | | 17x+13=149 | | -5x-7=33 | | 6x-11x-2=23 | | 6x-22=4x | | P(x)=8x-70 | | 10x+64=124 | | 21+a=2a | | x-4-3x=5x | | -3(-9v+6)-8v=5(v-5)-9 | | 4.8=2.6-0.3y | | -6=9-5y | | 7/4m-7=3/4-13 | | -7x+4-x=12 | | 2x+10=4x-28 | | -7(w-3)=4w-1 | | 10y+y=64 | | -45x-45=-75=75 | | -3x+5=5x+21 | | 3x+56=2x+60 | | 16x+46=62 | | G(2)=-3x+2 | | 5x-(9+x)=70 | | 6x+63=81 | | 5x(+10)=30 | | 8x–(3x–1)=2 | | 3r+10=15r-10 | | 5x(9+x)=70 |

Equations solver categories