Solve, using cross-multiplication :
6x + 7y - 11 = 0
5x + 2y = 13
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4x + 3y = 17
3x - 4y + 6 = 0
3x + 4y = 11
2x + 3y = 8
5x + 4y + 14 = 0
3x = -10 - 4y
x - y + 2 = 0
7x + 9y = 130