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90=10(x-4)
We move all terms to the left:
90-(10(x-4))=0
We calculate terms in parentheses: -(10(x-4)), so:We get rid of parentheses
10(x-4)
We multiply parentheses
10x-40
Back to the equation:
-(10x-40)
-10x+40+90=0
We add all the numbers together, and all the variables
-10x+130=0
We move all terms containing x to the left, all other terms to the right
-10x=-130
x=-130/-10
x=+13
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