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0=5x-(90+2x)
We move all terms to the left:
0-(5x-(90+2x))=0
We add all the numbers together, and all the variables
-(5x-(2x+90))+0=0
We add all the numbers together, and all the variables
-(5x-(2x+90))=0
We calculate terms in parentheses: -(5x-(2x+90)), so:We get rid of parentheses
5x-(2x+90)
We get rid of parentheses
5x-2x-90
We add all the numbers together, and all the variables
3x-90
Back to the equation:
-(3x-90)
-3x+90=0
We move all terms containing x to the left, all other terms to the right
-3x=-90
x=-90/-3
x=+30
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