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10+2f+10=-7+5f
We move all terms to the left:
10+2f+10-(-7+5f)=0
We add all the numbers together, and all the variables
2f-(5f-7)+10+10=0
We add all the numbers together, and all the variables
2f-(5f-7)+20=0
We get rid of parentheses
2f-5f+7+20=0
We add all the numbers together, and all the variables
-3f+27=0
We move all terms containing f to the left, all other terms to the right
-3f=-27
f=-27/-3
f=+9
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