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5x-18=-4x+90
We move all terms to the left:
5x-18-(-4x+90)=0
We get rid of parentheses
5x+4x-90-18=0
We add all the numbers together, and all the variables
9x-108=0
We move all terms containing x to the left, all other terms to the right
9x=108
x=108/9
x=12
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