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108+90+4x+4x+4x+12=540
We move all terms to the left:
108+90+4x+4x+4x+12-(540)=0
We add all the numbers together, and all the variables
12x-330=0
We move all terms containing x to the left, all other terms to the right
12x=330
x=330/12
x=27+1/2
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