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4x=42+3y
Add 3y to both sides.
4x=3y+42
The equation is in standard form.
\frac{4x}{4}=\frac{3y+42}{4}
Divide both sides by 4.
x=\frac{3y+42}{4}
Dividing by 4 undoes the multiplication by 4.
x=\frac{3y}{4}+\frac{21}{2}
Divide 42+3y by 4.
-3y=42-4x
Subtract 4x from both sides.
\frac{-3y}{-3}=\frac{42-4x}{-3}
Divide both sides by -3.
y=\frac{42-4x}{-3}
Dividing by -3 undoes the multiplication by -3.
y=\frac{4x}{3}-14
Divide 42-4x by -3.