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3f-13-12f=5-10f
We move all terms to the left:
3f-13-12f-(5-10f)=0
We add all the numbers together, and all the variables
3f-12f-(-10f+5)-13=0
We add all the numbers together, and all the variables
-9f-(-10f+5)-13=0
We get rid of parentheses
-9f+10f-5-13=0
We add all the numbers together, and all the variables
f-18=0
We move all terms containing f to the left, all other terms to the right
f=18
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