21=2a+5a

Simple and best practice solution for 21=2a+5a 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+5a equation: 



21=2a+5a

We move all terms to the left:

21-(2a+5a)=0

We add all the numbers together, and all the variables

-(+7a)+21=0

We get rid of parentheses

-7a+21=0

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

-7a=-21

a=-21/-7

a=+3

See similar equations:

| 10=-2a-3a | | 25=a+4a | | 24=3x=3x+3(7-1) | | -30=-5a-a | | 12=-2a-4a | | B-a=17 | | 4=-2a-2a | | 0.1a+0.8(14−a)=4.90.1a+0.8(14-a)=4.9 | | -35=5v+2v | | 5x-2x=88 | | 4x2−18=−9 | | 18=9a+9a | | 2x^-3x+9=0 | | x+7/14=1-2/2x | | 3r2-9r=5 | | 25.25=1.5^x | | 14x-10=90 | | 2x+5=33x+9 | | 143=(3x-2)+(3x-2)+x | | -2=3-e | | 2=8n-7n | | 22x-4=90 | | 19+2q=87 | | -6+u/5=-1 | | 7x^2-7/2x^2-56=0 | | p/3+8=10 | | a^2-40-3a=0 | | .5(x+18)=4(2x-6)-9 | | 2=16v/10 | | .75q^2=108 | | 18=k/3+14 | | 22x-4=180 |

Equations solver categories