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-3+2f+7=-12+3f
We move all terms to the left:
-3+2f+7-(-12+3f)=0
We add all the numbers together, and all the variables
2f-(3f-12)-3+7=0
We add all the numbers together, and all the variables
2f-(3f-12)+4=0
We get rid of parentheses
2f-3f+12+4=0
We add all the numbers together, and all the variables
-1f+16=0
We move all terms containing f to the left, all other terms to the right
-f=-16
f=-16/-1
f=+16
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