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{ 2x - 2y = 1 / * (-3)
b){ 5x - 3/4y = 6 /*4
{ 4x - 6y = 7 /*(-5)
c) { 5x - 2y = 1 /*3
{ 7x + 3y = 9 /*2
d) { 12x - 3/4y = -3 /*2
{ 8x + 5/6y = 7 /*(-3)