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3x+23+10x-6+7x-4+97+90=540
We move all terms to the left:
3x+23+10x-6+7x-4+97+90-(540)=0
We add all the numbers together, and all the variables
20x-340=0
We move all terms containing x to the left, all other terms to the right
20x=340
x=340/20
x=17
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