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3700+31x=4228+42x
We move all terms to the left:
3700+31x-(4228+42x)=0
We add all the numbers together, and all the variables
31x-(42x+4228)+3700=0
We get rid of parentheses
31x-42x-4228+3700=0
We add all the numbers together, and all the variables
-11x-528=0
We move all terms containing x to the left, all other terms to the right
-11x=528
x=528/-11
x=-48
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