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7.4f=10f-7.8
We move all terms to the left:
7.4f-(10f-7.8)=0
We get rid of parentheses
7.4f-10f+7.8=0
We add all the numbers together, and all the variables
-2.6f+7.8=0
We move all terms containing f to the left, all other terms to the right
-2.6f=-7.8
f=-7.8/-2.6
f=3+-8.8817841970013E-16/2.6
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