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4a -3b +5
-2a -5b +6
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2a -8b +11
b) de 2x - 3y - 1 Restar x + 2y - 4
2x - 3y - 1
-x -2y +4
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x -5y +3
c) De -5x + 2y + 3 Restar 2x - 4y + 4
-5x + 2y + 3
-2x + 4y - 4
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-7x +8y -1