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To solve for `y`, we need to isolate `y` on one side of the equation.
Starting with `-2x - y = 10`, we want to get rid of the `-2x` term. We can do this by adding `-2x` to both sides of the equation:
`-2x - y + 2x = 10 + 2x`
This simplifies to:
`-y = 10 + 2x`
To isolate `y`, we can multiply both sides of the equation by `-1`:
`-1 * (-y) = -1 * (10 + 2x)`
This gives us:
`y = -10 - 2x`
Therefore, the equation is `y = -10 - 2x`.