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-91=-2x+3(-5x+15)
We move all terms to the left:
-91-(-2x+3(-5x+15))=0
We calculate terms in parentheses: -(-2x+3(-5x+15)), so:We get rid of parentheses
-2x+3(-5x+15)
We multiply parentheses
-2x-15x+45
We add all the numbers together, and all the variables
-17x+45
Back to the equation:
-(-17x+45)
17x-45-91=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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