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3x-131=37-5x
We move all terms to the left:
3x-131-(37-5x)=0
We add all the numbers together, and all the variables
3x-(-5x+37)-131=0
We get rid of parentheses
3x+5x-37-131=0
We add all the numbers together, and all the variables
8x-168=0
We move all terms containing x to the left, all other terms to the right
8x=168
x=168/8
x=21
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