Solve for x
x=\frac{4}{f+3}
f\neq -3
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fx+3x=4
Add 3x to both sides.
\left(f+3\right)x=4
Combine all terms containing x.
\frac{\left(f+3\right)x}{f+3}=\frac{4}{f+3}
Divide both sides by f+3.
x=\frac{4}{f+3}
Dividing by f+3 undoes the multiplication by f+3.
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