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