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x=3.5(180-x)
We move all terms to the left:
x-(3.5(180-x))=0
We add all the numbers together, and all the variables
x-(3.5(-1x+180))=0
We calculate terms in parentheses: -(3.5(-1x+180)), so:We get rid of parentheses
3.5(-1x+180)
We multiply parentheses
-3.5x+630
Back to the equation:
-(-3.5x+630)
x+3.5x-630=0
We add all the numbers together, and all the variables
4.5x-630=0
We move all terms containing x to the left, all other terms to the right
4.5x=630
x=630/4.5
x=140
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