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7-(3x+1)=2x-4
We move all terms to the left:
7-(3x+1)-(2x-4)=0
We get rid of parentheses
-3x-2x-1+4+7=0
We add all the numbers together, and all the variables
-5x+10=0
We move all terms containing x to the left, all other terms to the right
-5x=-10
x=-10/-5
x=+2
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