Solve, using cross-multiplication :
4x - y = 5
5y - 4x = 7
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5x + 4y + 14 = 0
3x = -10 - 4y
x - y + 2 = 0
7x + 9y = 130
4x - 3y = 0
2x + 3y = 18
8x + 5y = 9
3x + 2y = 4