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15+2f+19=-20-16f
We simplify the equation to the form, which is simple to understand
15+2f+19=-20-16f
We move all terms containing f to the left and all other terms to the right.
+2f+16f=-20-15-19
We simplify left and right side of the equation.
+18f=-54
We divide both sides of the equation by 18 to get f.
f=-3
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