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90=6(8-7x)
We move all terms to the left:
90-(6(8-7x))=0
We add all the numbers together, and all the variables
-(6(-7x+8))+90=0
We calculate terms in parentheses: -(6(-7x+8)), so:We get rid of parentheses
6(-7x+8)
We multiply parentheses
-42x+48
Back to the equation:
-(-42x+48)
42x-48+90=0
We add all the numbers together, and all the variables
42x+42=0
We move all terms containing x to the left, all other terms to the right
42x=-42
x=-42/42
x=-1
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