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3x+16+2x+15+5x+10=91
We move all terms to the left:
3x+16+2x+15+5x+10-(91)=0
We add all the numbers together, and all the variables
10x-50=0
We move all terms containing x to the left, all other terms to the right
10x=50
x=50/10
x=5
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