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Mathematics, 02.12.2021 05:50 emmie50

If 9x + 7y = -1 and - 4x - 8y = 2 are true equations, what would be the value of 13x + 15y?

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If 9x + 7y = -1 and - 4x - 8y = 2 are true equations, what would be the value of 13x + 15y?...
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