\left\{ \begin{array} { l } { 2 x + y + 4 x = 180 } \end{array} \right.
Solve for x
x=-\frac{y}{6}+30
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6x+y=180
Combine 2x and 4x to get 6x.
6x=180-y
Subtract y from both sides.
\frac{6x}{6}=\frac{180-y}{6}
Divide both sides by 6.
x=\frac{180-y}{6}
Dividing by 6 undoes the multiplication by 6.
x=-\frac{y}{6}+30
Divide 180-y by 6.
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