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90=-5(6-6x)
We move all terms to the left:
90-(-5(6-6x))=0
We add all the numbers together, and all the variables
-(-5(-6x+6))+90=0
We calculate terms in parentheses: -(-5(-6x+6)), so:We get rid of parentheses
-5(-6x+6)
We multiply parentheses
30x-30
Back to the equation:
-(30x-30)
-30x+30+90=0
We add all the numbers together, and all the variables
-30x+120=0
We move all terms containing x to the left, all other terms to the right
-30x=-120
x=-120/-30
x=+4
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