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2x+15+5x+10+4x+13=71
We move all terms to the left:
2x+15+5x+10+4x+13-(71)=0
We add all the numbers together, and all the variables
11x-33=0
We move all terms containing x to the left, all other terms to the right
11x=33
x=33/11
x=3
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