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9x-137=5x+19
We move all terms to the left:
9x-137-(5x+19)=0
We get rid of parentheses
9x-5x-19-137=0
We add all the numbers together, and all the variables
4x-156=0
We move all terms containing x to the left, all other terms to the right
4x=156
x=156/4
x=39
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