Solve for y
y=17-3z
Solve for z
z=\frac{17-y}{3}
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3z+3+y=20
Add 1 and 2 to get 3.
3+y=20-3z
Subtract 3z from both sides.
y=20-3z-3
Subtract 3 from both sides.
y=17-3z
Subtract 3 from 20 to get 17.
3z+3+y=20
Add 1 and 2 to get 3.
3z+y=20-3
Subtract 3 from both sides.
3z+y=17
Subtract 3 from 20 to get 17.
3z=17-y
Subtract y from both sides.
\frac{3z}{3}=\frac{17-y}{3}
Divide both sides by 3.
z=\frac{17-y}{3}
Dividing by 3 undoes the multiplication by 3.
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