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-5x-20-3x+3=-7x-31
We move all terms to the left:
-5x-20-3x+3-(-7x-31)=0
We add all the numbers together, and all the variables
-8x-(-7x-31)-17=0
We get rid of parentheses
-8x+7x+31-17=0
We add all the numbers together, and all the variables
-1x+14=0
We move all terms containing x to the left, all other terms to the right
-x=-14
x=-14/-1
x=+14
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