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.2f + 0.6(f+20)=-8+.4f
We simplify the equation to the form, which is simple to understand
.2f + 0.6(f+20)=-8+.4f
Reorder the terms in parentheses
.2f+( + 0.6f+12)=-8+.4f
Remove unnecessary parentheses
+.2f + 0.6f+12=-8+.4f
We move all terms containing f to the left and all other terms to the right.
+ 0.2f + 0.6f-0.4f=-8-12
We simplify left and right side of the equation.
+ 0.4f=-20
We divide both sides of the equation by 0.4 to get f.
f=-50
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