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4x+(8x-18)=90
We move all terms to the left:
4x+(8x-18)-(90)=0
We get rid of parentheses
4x+8x-18-90=0
We add all the numbers together, and all the variables
12x-108=0
We move all terms containing x to the left, all other terms to the right
12x=108
x=108/12
x=9
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