Solve for b
b=9\left(x+y\right)
Solve for x
x=\frac{b-9y}{9}
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9x+9y=b
Use the distributive property to multiply 9 by x+y.
b=9x+9y
Swap sides so that all variable terms are on the left hand side.
9x+9y=b
Use the distributive property to multiply 9 by x+y.
9x=b-9y
Subtract 9y from both sides.
\frac{9x}{9}=\frac{b-9y}{9}
Divide both sides by 9.
x=\frac{b-9y}{9}
Dividing by 9 undoes the multiplication by 9.
x=\frac{b}{9}-y
Divide b-9y by 9.
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