\left\{ \begin{array} { c } { 2 x + y = 0 } \end{array} \right.
Solve for x
x=-\frac{y}{2}
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2x=-y
Subtract y from both sides. Anything subtracted from zero gives its negation.
\frac{2x}{2}=-\frac{y}{2}
Divide both sides by 2.
x=-\frac{y}{2}
Dividing by 2 undoes the multiplication by 2.
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