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90=3+2+15+f
We simplify the equation to the form, which is simple to understand
90=3+2+15+f
We move all terms containing f to the left and all other terms to the right.
-1f=+3+2+15-90
We simplify left and right side of the equation.
-1f=-70
We divide both sides of the equation by -01 to get f.
f=70
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