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(-5x+54)+(9x+24)=90
We move all terms to the left:
(-5x+54)+(9x+24)-(90)=0
We get rid of parentheses
-5x+9x+54+24-90=0
We add all the numbers together, and all the variables
4x-12=0
We move all terms containing x to the left, all other terms to the right
4x=12
x=12/4
x=3
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