(1)3m-4n=7 (2)3x+4y=2 (3)2x-3y=8 (4)9x+8y=-29m-10n=23 2x-y=5 3x+7y=0.5 4x+5y=-11
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![(1)3m-4n=7 (2)3x+4y=2 (3)2x-3y=8 (4)9x+8y=-29m-10n=23 2x-y=5 3x+7y=0.5 4x+5y=-11](/uploads/image/z/10746258-42-8.jpg?t=%281%293m-4n%3D7+%282%293x%EF%BC%8B4y%3D2+%283%292x-3y%3D8+%284%299x%EF%BC%8B8y%3D-29m-10n%3D23+2x-y%3D5+3x%EF%BC%8B7y%3D0.5+4x%EF%BC%8B5y%3D-11)
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