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142=-3x-5(-7x+10)
We move all terms to the left:
142-(-3x-5(-7x+10))=0
We calculate terms in parentheses: -(-3x-5(-7x+10)), so:We get rid of parentheses
-3x-5(-7x+10)
We multiply parentheses
-3x+35x-50
We add all the numbers together, and all the variables
32x-50
Back to the equation:
-(32x-50)
-32x+50+142=0
We add all the numbers together, and all the variables
-32x+192=0
We move all terms containing x to the left, all other terms to the right
-32x=-192
x=-192/-32
x=+6
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