Solve for a
a=\frac{x+2y}{4}
Solve for x
x=4a-2y
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12a=6y+3x
Swap sides so that all variable terms are on the left hand side.
12a=3x+6y
The equation is in standard form.
\frac{12a}{12}=\frac{3x+6y}{12}
Divide both sides by 12.
a=\frac{3x+6y}{12}
Dividing by 12 undoes the multiplication by 12.
a=\frac{x}{4}+\frac{y}{2}
Divide 6y+3x by 12.
3x=12a-6y
Subtract 6y from both sides.
\frac{3x}{3}=\frac{12a-6y}{3}
Divide both sides by 3.
x=\frac{12a-6y}{3}
Dividing by 3 undoes the multiplication by 3.
x=4a-2y
Divide 12a-6y by 3.
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