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90=(-5x+55)+(9x+3)
We move all terms to the left:
90-((-5x+55)+(9x+3))=0
We calculate terms in parentheses: -((-5x+55)+(9x+3)), so:We get rid of parentheses
(-5x+55)+(9x+3)
We get rid of parentheses
-5x+9x+55+3
We add all the numbers together, and all the variables
4x+58
Back to the equation:
-(4x+58)
-4x-58+90=0
We add all the numbers together, and all the variables
-4x+32=0
We move all terms containing x to the left, all other terms to the right
-4x=-32
x=-32/-4
x=+8
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