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5x=3(x+90)
We move all terms to the left:
5x-(3(x+90))=0
We calculate terms in parentheses: -(3(x+90)), so:We get rid of parentheses
3(x+90)
We multiply parentheses
3x+270
Back to the equation:
-(3x+270)
5x-3x-270=0
We add all the numbers together, and all the variables
2x-270=0
We move all terms containing x to the left, all other terms to the right
2x=270
x=270/2
x=135
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