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100x=y\left(x+100\right)
Variable x cannot be equal to -100 since division by zero is not defined. Multiply both sides of the equation by x+100.
100x=yx+100y
Use the distributive property to multiply y by x+100.
100x-yx=100y
Subtract yx from both sides.
\left(100-y\right)x=100y
Combine all terms containing x.
\frac{\left(100-y\right)x}{100-y}=\frac{100y}{100-y}
Divide both sides by -y+100.
x=\frac{100y}{100-y}
Dividing by -y+100 undoes the multiplication by -y+100.
x=\frac{100y}{100-y}\text{, }x\neq -100
Variable x cannot be equal to -100.
100x=y\left(x+100\right)
Multiply both sides of the equation by x+100.
100x=yx+100y
Use the distributive property to multiply y by x+100.
yx+100y=100x
Swap sides so that all variable terms are on the left hand side.
\left(x+100\right)y=100x
Combine all terms containing y.
\frac{\left(x+100\right)y}{x+100}=\frac{100x}{x+100}
Divide both sides by 100+x.
y=\frac{100x}{x+100}
Dividing by 100+x undoes the multiplication by 100+x.