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155=8x-(7-10x)
We move all terms to the left:
155-(8x-(7-10x))=0
We add all the numbers together, and all the variables
-(8x-(-10x+7))+155=0
We calculate terms in parentheses: -(8x-(-10x+7)), so:We get rid of parentheses
8x-(-10x+7)
We get rid of parentheses
8x+10x-7
We add all the numbers together, and all the variables
18x-7
Back to the equation:
-(18x-7)
-18x+7+155=0
We add all the numbers together, and all the variables
-18x+162=0
We move all terms containing x to the left, all other terms to the right
-18x=-162
x=-162/-18
x=+9
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