y=x \% +4
Solve for x
x=100\left(y-4\right)
Solve for y
y=\frac{x+400}{100}
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\frac{x}{100}+4=y
Swap sides so that all variable terms are on the left hand side.
\frac{x}{100}=y-4
Subtract 4 from both sides.
x=100y-400
Multiply both sides of the equation by 100.
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