Solve for m
m=\frac{20-3y-x}{7}
Solve for x
x=20-7m-3y
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3y+7m=20-x
Subtract x from both sides.
7m=20-x-3y
Subtract 3y from both sides.
7m=20-3y-x
The equation is in standard form.
\frac{7m}{7}=\frac{20-3y-x}{7}
Divide both sides by 7.
m=\frac{20-3y-x}{7}
Dividing by 7 undoes the multiplication by 7.
x+7m=20-3y
Subtract 3y from both sides.
x=20-3y-7m
Subtract 7m from both sides.
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