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x in (-oo:+oo)
y = (1/10)*x+2/5 // - (1/10)*x+2/5
y-((1/10)*x)-(2/5) = 0
(-1/10)*x+y-2/5 = 0
y-1/10*x-2/5 = 0 // - y-2/5
-1/10*x = -(y-2/5) // : -1/10
x = (-(y-2/5))/(-1/10)
x = -10*(2/5-y)
x = -10*(2/5-y)
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