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x in (-oo:+oo)
y = (4/7)*x-(1/7) // - (4/7)*x-(1/7)
y-((4/7)*x)+1/7 = 0
(-4/7)*x+y+1/7 = 0
y-4/7*x+1/7 = 0 // - y+1/7
-4/7*x = -(y+1/7) // : -4/7
x = (-(y+1/7))/(-4/7)
x = 7/4*(y+1/7)
x = 7/4*(y+1/7)
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