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4x-1+3x+5x+4+105=540
We move all terms to the left:
4x-1+3x+5x+4+105-(540)=0
We add all the numbers together, and all the variables
12x-432=0
We move all terms containing x to the left, all other terms to the right
12x=432
x=432/12
x=36
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