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7f+3-10f=15
We simplify the equation to the form, which is simple to understand
7f+3-10f=15
We move all terms containing f to the left and all other terms to the right.
+7f-10f=+15-3
We simplify left and right side of the equation.
-3f=+12
We divide both sides of the equation by -3 to get f.
f=-4
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