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156=7x+2(5x+10)
We move all terms to the left:
156-(7x+2(5x+10))=0
We calculate terms in parentheses: -(7x+2(5x+10)), so:We get rid of parentheses
7x+2(5x+10)
We multiply parentheses
7x+10x+20
We add all the numbers together, and all the variables
17x+20
Back to the equation:
-(17x+20)
-17x-20+156=0
We add all the numbers together, and all the variables
-17x+136=0
We move all terms containing x to the left, all other terms to the right
-17x=-136
x=-136/-17
x=+8
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