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If 2x +y=-7 and 3x=6+4y are simultaneous equation, what is the value of x-y

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If 2x +y=-7 and 3x=6+4y are simultaneous equation, what is the value of x-y​

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If 2x +y=-7 and 3x=6+4y are simultaneous equation, what is the value of x-y