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2x+90=18-
We move all terms to the left:
2x+90-(18-)=0
We add all the numbers together, and all the variables
2x+90-0=0
We add all the numbers together, and all the variables
2x+90=0
We move all terms containing x to the left, all other terms to the right
2x=-90
x=-90/2
x=-45
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