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3x-7y = 9
y = -5x-23
3x-7(-5x-23) = 9
y = -5x-23
3x-7*(-5x)-7*(-23) = 9
y = -5x-23
3x + 35x + 161 = 9
y = -5x - 23
38x = 9-161
y = -5x - 23
38x = -152 |:38
y = -5x - 23
x = -4
y = -5*(-4) - 23
x = -4
y = 20-23
x = -4
y = -3
x = -4
y = -91/37 = -2 17/37
x = -152/37 = -4 4/37