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x in (-oo:+oo)
Y-4 = (1/7)*(x-3) // - (1/7)*(x-3)
Y-((1/7)*(x-3))-4 = 0
(-1/7)*(x-3)+Y-4 = 0
Y-1/7*(x-3)-4 = 0
Y-1/7*(x-3)-4 = 0
Y-1/7*x-4+3/7 = 0
Y-1/7*x-25/7 = 0
Y-1/7*x-25/7 = 0
Y-1/7*x-25/7 = 0 // - Y-25/7
-1/7*x = -(Y-25/7) // : -1/7
x = (-(Y-25/7))/(-1/7)
x = -7*(25/7-Y)
x = -7*(25/7-Y)
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