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x in (-oo:+oo)
y = -((7*x)/2)-3 // + -((7*x)/2)-3
(7*x)/2+y+3 = 0
7/2*x+y+3 = 0 // - y+3
7/2*x = -(y+3) // : 7/2
x = (-(y+3))/7/2
x = -2/7*(y+3)
x = -2/7*(y+3)
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