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3x-4y=41......6(3x-4y=41).....18x-24y=246
11x+6y=47..4(11x+6y=47)..44x+24y=188
62x=434....x=434/62....x=7
si x=7 entonces y=-5
2° ejemplo
9x+11y=-14...... 5(9x+11=-14)........45x+55y=-70
6x-5y=-34..........11(6x-5y=-374)......66x-55y=-374
111x=-444....x=-444/111....x=-4
si x=-4.......entonces y=2