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y-3-9=9\left(x+1\right)
Multiply both sides of the equation by 3.
y-12=9\left(x+1\right)
Subtract 9 from -3 to get -12.
y-12=9x+9
Use the distributive property to multiply 9 by x+1.
9x+9=y-12
Swap sides so that all variable terms are on the left hand side.
9x=y-12-9
Subtract 9 from both sides.
9x=y-21
Subtract 9 from -12 to get -21.
\frac{9x}{9}=\frac{y-21}{9}
Divide both sides by 9.
x=\frac{y-21}{9}
Dividing by 9 undoes the multiplication by 9.
x=\frac{y}{9}-\frac{7}{3}
Divide y-21 by 9.
y-3-9=9\left(x+1\right)
Multiply both sides of the equation by 3.
y-12=9\left(x+1\right)
Subtract 9 from -3 to get -12.
y-12=9x+9
Use the distributive property to multiply 9 by x+1.
y=9x+9+12
Add 12 to both sides.
y=9x+21
Add 9 and 12 to get 21.