21+3x=2(-x+8)-20

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Solution for 21+3x=2(-x+8)-20 equation:



21+3x=2(-x+8)-20
We move all terms to the left:
21+3x-(2(-x+8)-20)=0
We add all the numbers together, and all the variables
3x-(2(-1x+8)-20)+21=0
We calculate terms in parentheses: -(2(-1x+8)-20), so:
2(-1x+8)-20
We multiply parentheses
-2x+16-20
We add all the numbers together, and all the variables
-2x-4
Back to the equation:
-(-2x-4)
We get rid of parentheses
3x+2x+4+21=0
We add all the numbers together, and all the variables
5x+25=0
We move all terms containing x to the left, all other terms to the right
5x=-25
x=-25/5
x=-5

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