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2x=3(90-x)
We move all terms to the left:
2x-(3(90-x))=0
We add all the numbers together, and all the variables
2x-(3(-1x+90))=0
We calculate terms in parentheses: -(3(-1x+90)), so:We get rid of parentheses
3(-1x+90)
We multiply parentheses
-3x+270
Back to the equation:
-(-3x+270)
2x+3x-270=0
We add all the numbers together, and all the variables
5x-270=0
We move all terms containing x to the left, all other terms to the right
5x=270
x=270/5
x=54
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