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31x-4=16x+4
We move all terms to the left:
31x-4-(16x+4)=0
We get rid of parentheses
31x-16x-4-4=0
We add all the numbers together, and all the variables
15x-8=0
We move all terms containing x to the left, all other terms to the right
15x=8
x=8/15
x=8/15
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