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x in (-oo:+oo)
y = (-9/37)*x-(13/21) // - (-9/37)*x-(13/21)
y-((-9/37)*x)+13/21 = 0
(9/37)*x+y+13/21 = 0
9/37*x+y+13/21 = 0 // - y+13/21
9/37*x = -(y+13/21) // : 9/37
x = (-(y+13/21))/9/37
x = -37/9*(y+13/21)
x = -37/9*(y+13/21)
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