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90=5x-5(4+3x)
We move all terms to the left:
90-(5x-5(4+3x))=0
We add all the numbers together, and all the variables
-(5x-5(3x+4))+90=0
We calculate terms in parentheses: -(5x-5(3x+4)), so:We get rid of parentheses
5x-5(3x+4)
We multiply parentheses
5x-15x-20
We add all the numbers together, and all the variables
-10x-20
Back to the equation:
-(-10x-20)
10x+20+90=0
We add all the numbers together, and all the variables
10x+110=0
We move all terms containing x to the left, all other terms to the right
10x=-110
x=-110/10
x=-11
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