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7f-4+2=-15
We simplify the equation to the form, which is simple to understand
7f-4+2=-15
We move all terms containing f to the left and all other terms to the right.
+7f=-15+4-2
We simplify left and right side of the equation.
+7f=-13
We divide both sides of the equation by 7 to get f.
f=-1.8571428571429
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