Solve for x
x=\frac{21}{2}-4z
Solve for z
z=-\frac{x}{4}+\frac{21}{8}
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4x=42-16z
Subtract 16z from both sides.
\frac{4x}{4}=\frac{42-16z}{4}
Divide both sides by 4.
x=\frac{42-16z}{4}
Dividing by 4 undoes the multiplication by 4.
x=\frac{21}{2}-4z
Divide 42-16z by 4.
16z=42-4x
Subtract 4x from both sides.
\frac{16z}{16}=\frac{42-4x}{16}
Divide both sides by 16.
z=\frac{42-4x}{16}
Dividing by 16 undoes the multiplication by 16.
z=-\frac{x}{4}+\frac{21}{8}
Divide 42-4x by 16.
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