Solve the following simultaneous equations:
10x + 3y = 75, 6x - 5y = 11
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5x + 4y = 4, x - 12y = 20
x + 2y + 9 = 0, 3x + 4y + 17 = 0
7x - 2y = 20, 11x + 15y + 23 = 0