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5x+159=7(7x-15)
We move all terms to the left:
5x+159-(7(7x-15))=0
We calculate terms in parentheses: -(7(7x-15)), so:We get rid of parentheses
7(7x-15)
We multiply parentheses
49x-105
Back to the equation:
-(49x-105)
5x-49x+105+159=0
We add all the numbers together, and all the variables
-44x+264=0
We move all terms containing x to the left, all other terms to the right
-44x=-264
x=-264/-44
x=+6
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