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-7+4-3x=-2x-12
We move all terms to the left:
-7+4-3x-(-2x-12)=0
We add all the numbers together, and all the variables
-3x-(-2x-12)-3=0
We get rid of parentheses
-3x+2x+12-3=0
We add all the numbers together, and all the variables
-1x+9=0
We move all terms containing x to the left, all other terms to the right
-x=-9
x=-9/-1
x=+9
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