\{ 3 x + y = 0
Solve for x
x=-\frac{y}{3}
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3x=-y
Subtract y from both sides. Anything subtracted from zero gives its negation.
\frac{3x}{3}=-\frac{y}{3}
Divide both sides by 3.
x=-\frac{y}{3}
Dividing by 3 undoes the multiplication by 3.
Examples
Quadratic equation
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Linear equation
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Matrix
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Limits
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