Solve for y
y=\frac{54-x}{7}
Solve for x
x=54-7y
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7y=54-x
Subtract x from both sides.
\frac{7y}{7}=\frac{54-x}{7}
Divide both sides by 7.
y=\frac{54-x}{7}
Dividing by 7 undoes the multiplication by 7.
x=54-7y
Subtract 7y from both sides.
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