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x in (-oo:+oo)
y = 10-((4*x)/3) // - 10-((4*x)/3)
(4*x)/3+y-10 = 0
4/3*x+y-10 = 0 // - y-10
4/3*x = -(y-10) // : 4/3
x = (-(y-10))/4/3
x = 3/4*(10-y)
x = 3/4*(10-y)
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