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-2(-x+3)=2(-x-21)
We move all terms to the left:
-2(-x+3)-(2(-x-21))=0
We add all the numbers together, and all the variables
-2(-1x+3)-(2(-1x-21))=0
We multiply parentheses
2x-(2(-1x-21))-6=0
We calculate terms in parentheses: -(2(-1x-21)), so:We get rid of parentheses
2(-1x-21)
We multiply parentheses
-2x-42
Back to the equation:
-(-2x-42)
2x+2x+42-6=0
We add all the numbers together, and all the variables
4x+36=0
We move all terms containing x to the left, all other terms to the right
4x=-36
x=-36/4
x=-9
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