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x+60+x+15+x+25+x+90=540
We move all terms to the left:
x+60+x+15+x+25+x+90-(540)=0
We add all the numbers together, and all the variables
4x-350=0
We move all terms containing x to the left, all other terms to the right
4x=350
x=350/4
x=87+1/2
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