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5(x-6)  + 6 (4y -1) = 7
5x - 30 + 24y - 6 = 7
5x + 24y = 31

3(3x + 1) - 4(3-8y) = 60
9x + 3 - 12 + 32y = 60
9x + 32y = 69

5x + 24y = 31
9x + 32y = 69

20 x +  96 y = 124
27 x +  96 y = 207
______________  -

-7x = -83
x = 83/7

9x + 32y = 69
9(83/7) + 32y = 69
747/7 + 32y = 483/7
32y = 483/7 - 747/7
32y = -264/7
y = -264/7 × 1/32
y = -11/28