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-30=-15(2x-10)
We move all terms to the left:
-30-(-15(2x-10))=0
We calculate terms in parentheses: -(-15(2x-10)), so:We get rid of parentheses
-15(2x-10)
We multiply parentheses
-30x+150
Back to the equation:
-(-30x+150)
30x-150-30=0
We add all the numbers together, and all the variables
30x-180=0
We move all terms containing x to the left, all other terms to the right
30x=180
x=180/30
x=6
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