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As an equation, x = -2y cannot be solved without further information.
To solve an equation (or multiple equations), the number of unknowns (x, y etc.) must be equal to or less than the number of equations. In your example you have 2 unknowns and 1 equation, so it does not work.
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Earn +20 ptsQ: How do you solve x equals -2y?
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Solve for x 3x - 2y equals 6?
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