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-2x-74=-9x+31
We move all terms to the left:
-2x-74-(-9x+31)=0
We get rid of parentheses
-2x+9x-31-74=0
We add all the numbers together, and all the variables
7x-105=0
We move all terms containing x to the left, all other terms to the right
7x=105
x=105/7
x=15
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