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x in (-oo:+oo)
y = (3/2)*(x-5)+9 // - (3/2)*(x-5)+9
y-((3/2)*(x-5))-9 = 0
(-3/2)*(x-5)+y-9 = 0
y-3/2*(x-5)-9 = 0
y-3/2*(x-5)-9 = 0
y-3/2*x-9+15/2 = 0
y-3/2*x-3/2 = 0
y-3/2*x-3/2 = 0
y-3/2*x-3/2 = 0 // - y-3/2
-3/2*x = -(y-3/2) // : -3/2
x = (-(y-3/2))/(-3/2)
x = -2/3*(3/2-y)
x = -2/3*(3/2-y)
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