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x+90=(4x-66)
We move all terms to the left:
x+90-((4x-66))=0
We calculate terms in parentheses: -((4x-66)), so:We get rid of parentheses
(4x-66)
We get rid of parentheses
4x-66
Back to the equation:
-(4x-66)
x-4x+66+90=0
We add all the numbers together, and all the variables
-3x+156=0
We move all terms containing x to the left, all other terms to the right
-3x=-156
x=-156/-3
x=+52
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