Solve for x
x=91y+z
Solve for y
y=\frac{x-z}{91}
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x-90y=z+y
Swap sides so that all variable terms are on the left hand side.
x=z+y+90y
Add 90y to both sides.
x=z+91y
Combine y and 90y to get 91y.
z+y+90y=x
Add 90y to both sides.
z+91y=x
Combine y and 90y to get 91y.
91y=x-z
Subtract z from both sides.
\frac{91y}{91}=\frac{x-z}{91}
Divide both sides by 91.
y=\frac{x-z}{91}
Dividing by 91 undoes the multiplication by 91.
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