Solve for x
x=21-z-2y
Solve for y
y=\frac{21-z-x}{2}
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2x+2z=42-4y
Subtract 4y from both sides.
2x=42-4y-2z
Subtract 2z from both sides.
2x=42-2z-4y
The equation is in standard form.
\frac{2x}{2}=\frac{42-2z-4y}{2}
Divide both sides by 2.
x=\frac{42-2z-4y}{2}
Dividing by 2 undoes the multiplication by 2.
x=21-z-2y
Divide 42-4y-2z by 2.
4y+2z=42-2x
Subtract 2x from both sides.
4y=42-2x-2z
Subtract 2z from both sides.
4y=42-2z-2x
The equation is in standard form.
\frac{4y}{4}=\frac{42-2z-2x}{4}
Divide both sides by 4.
y=\frac{42-2z-2x}{4}
Dividing by 4 undoes the multiplication by 4.
y=\frac{21-z-x}{2}
Divide 42-2x-2z by 4.
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