Solve for r
r=56
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r\times 300=\left(r-14\right)\times 400
Variable r cannot be equal to any of the values 0,14 since division by zero is not defined. Multiply both sides of the equation by r\left(r-14\right), the least common multiple of r-14,r.
r\times 300=400r-5600
Use the distributive property to multiply r-14 by 400.
r\times 300-400r=-5600
Subtract 400r from both sides.
-100r=-5600
Combine r\times 300 and -400r to get -100r.
r=\frac{-5600}{-100}
Divide both sides by -100.
r=56
Divide -5600 by -100 to get 56.
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