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5(90-x)=(180-x)
We move all terms to the left:
5(90-x)-((180-x))=0
We add all the numbers together, and all the variables
5(-1x+90)-((-1x+180))=0
We multiply parentheses
-5x-((-1x+180))+450=0
We calculate terms in parentheses: -((-1x+180)), so:We get rid of parentheses
(-1x+180)
We get rid of parentheses
-1x+180
Back to the equation:
-(-1x+180)
-5x+1x-180+450=0
We add all the numbers together, and all the variables
-4x+270=0
We move all terms containing x to the left, all other terms to the right
-4x=-270
x=-270/-4
x=67+1/2
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