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2.45-3.1f=21.05
We simplify the equation to the form, which is simple to understand
2.45-3.1f=21.05
We move all terms containing f to the left and all other terms to the right.
-3.1f=+21.05-2.45
We simplify left and right side of the equation.
-3.1f=+18.6
We divide both sides of the equation by -3.1 to get f.
f=-6
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