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8x + 2y = -10

As all terms have a factor of 2 then the values can be reduced accordingly.

4x + y = -5

If required, the equation can be re-written to show x or y as the subject.

4x + y = -5 : 4x = -y - 5 : x = (-y -5)/4........this can also be written as x = (y + 5)/-4

4x + y = -5 : y = -4x - 5

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