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3x+7+7x-4+3x+5+2x-9=540
We move all terms to the left:
3x+7+7x-4+3x+5+2x-9-(540)=0
We add all the numbers together, and all the variables
15x-541=0
We move all terms containing x to the left, all other terms to the right
15x=541
x=541/15
x=36+1/15
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