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x in (-oo:+oo)
x/15+y/6 = -5 // + 5
x/15+y/6+5 = 0
1/15*x+1/6*y+5 = 0 // - 1/6*y+5
1/15*x = -(1/6*y+5) // : 1/15
x = (-(1/6*y+5))/1/15
x = -15*(1/6*y+5)
x = -15*(1/6*y+5)
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