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665.70=42(x+2.85)
We move all terms to the left:
665.70-(42(x+2.85))=0
We add all the numbers together, and all the variables
-(42(x+2.85))+665.7=0
We calculate terms in parentheses: -(42(x+2.85)), so:We get rid of parentheses
42(x+2.85)
We multiply parentheses
42x+119.7
Back to the equation:
-(42x+119.7)
-42x-119.7+665.7=0
We add all the numbers together, and all the variables
-42x+546=0
We move all terms containing x to the left, all other terms to the right
-42x=-546
x=-546/-42
x=+13
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