21-3(a-7)=a+20

Simple and best practice solution for 21-3(a-7)=a+20 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 21-3(a-7)=a+20 equation: 



21-3(a-7)=a+20

We move all terms to the left:

21-3(a-7)-(a+20)=0

We multiply parentheses

-3a-(a+20)+21+21=0

We get rid of parentheses

-3a-a-20+21+21=0

We add all the numbers together, and all the variables

-4a+22=0

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

-4a=-22

a=-22/-4

a=5+1/2

See similar equations:

| 18+5+17h=-19+14h | | -20-11k=18-9k | | 45x25=1,125 | | 25^x-1+100=5^2x-1 | | 1+4f=-4f+9f-5 | | 4.16^x=8^(1-x) | | (8x-9)=(7x+1) | | P=12+7d/11 | | 8g-7+7=9+7g | | 4.16^x=8^1-x | | 3a-4=2(4-2) | | 6b+1=9+5b | | -9x-10=-8x | | 8x2^x+2=32 | | 6x=12- | | -8x=5-9x | | -3x-1=-5x-9 | | -x=4x-10 | | 2(k–3)=4(k–6) | | 320=4×x | | 30=5(x+5£ | | 6(x+4)+5=6x+5 | | 2n-48=n | | 5t+7=3/2t-14 | | 448=-16t^2+256t+0 | | 4x(5•5+5•7)=150 | | c=9πG | | 448=-16t+256t+0 | | 60=3t/7 | | x+(2.666)x=77 | | 1/3r=-8/5 | | 39,2x=22,4x |

Equations solver categories