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f+3f-2f=6+6+6
We simplify the equation to the form, which is simple to understand
f+3f-2f=6+6+6
We move all terms containing f to the left and all other terms to the right.
+1f+3f-2f=+6+6+6
We simplify left and right side of the equation.
+2f=+18
We divide both sides of the equation by 2 to get f.
f=9
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