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x - 3y = -5
4x + 3y = 25
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x - 3y = -5 (1)
4x + 3y = 25 (2)
Add the two equations, (1) and (2) (both sides).
Then the terms with 3y will cancel each other, and you will get a single equation for x:
5x = -5 + 25, or
5x = 20.
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Please complete the solution yourself.