21-(-9)=a

Simple and best practice solution for 21-(-9)=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-(-9)=a equation:



21-(-9)=a
We move all terms to the left:
21-(-9)-(a)=0
We add all the numbers together, and all the variables
-1a+30=0
We move all terms containing a to the left, all other terms to the right
-a=-30
a=-30/-1
a=+30

See similar equations:

| 3×(x-14)+8=8+5×(x-10) | | (-11)-22=a | | 0-10=a | | y=15+6y | | 6x+12=52−2x | | 0.2t^2+3t+10.4=100 | | 5-(-25)=a | | 20=21-4x | | w-5.4=3.27 | | 4n^2=-n+95 | | 2x+15+x+2x=180 | | 5-16=a | | 0.2t^2+3t=10.4 | | y-6.29=5.8 | | (-7)+n+(-37)=-12 | | 148/x=4/1 | | x+2.9=8.23 | | (-9)+(-11)+n=9 | | n+(-15)+9=13 | | 7(2x−4)=2−(30−x) | | (-7)+n+8=6 | | (-3)+(-1)+(-2)=n | | k/2​ +21​ =3 | | x55=511. | | (-7)+(n+(-37)=-12 | | 2(x+(1/3))=(3/2x)+1+(1/2x)-(1/3) | | 32÷4+4×8=x | | -5x+2=64 | | (-39)+n=19 | | 10+4f=2f+8 | | 2(x+1/3)=3/2x+1+1/2x-1/3 | | 22=1/2h(8+3) |

Equations solver categories