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(f*1)+(20*4.2)+(10*6.3)=400*0.5
We simplify the equation to the form, which is simple to understand
(f*1)+(20*4.2)+(10*6.3)=400*0.5
Remove unnecessary parentheses
+1f+(+84)+(+63)=+200
Remove unnecessary parentheses
+1f+84+(+63+)=+200
Remove unnecessary parentheses
+1f+84+63=+200
We move all terms containing f to the left and all other terms to the right.
+1f=+200-84-63
We simplify left and right side of the equation.
+1f=+53
We divide both sides of the equation by 1 to get f.
f=53
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