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x in (-oo:+oo)
(3/8)*x-(4*y) = -10 // + 10
(3/8)*x-(4*y)+10 = 0
(3/8)*x-4*y+10 = 0
3/8*x-4*y+10 = 0 // - 10-4*y
3/8*x = -(10-4*y) // : 3/8
x = (-(10-4*y))/3/8
x = -8/3*(10-4*y)
x = -8/3*(10-4*y)
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