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3x+3x+3x+4x+5x=540
We move all terms to the left:
3x+3x+3x+4x+5x-(540)=0
We add all the numbers together, and all the variables
18x-540=0
We move all terms containing x to the left, all other terms to the right
18x=540
x=540/18
x=30
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