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-142=-2x+6(-3x+3)
We move all terms to the left:
-142-(-2x+6(-3x+3))=0
We calculate terms in parentheses: -(-2x+6(-3x+3)), so:We get rid of parentheses
-2x+6(-3x+3)
We multiply parentheses
-2x-18x+18
We add all the numbers together, and all the variables
-20x+18
Back to the equation:
-(-20x+18)
20x-18-142=0
We add all the numbers together, and all the variables
20x-160=0
We move all terms containing x to the left, all other terms to the right
20x=160
x=160/20
x=8
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