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x in (-oo:+oo)
(3/8)*x+5/2 = -1/2 // + -1/2
(3/8)*x+5/2-(-1/2) = 0
(3/8)*x+5/2+1/2 = 0
3/8*x+3 = 0 // - 3
3/8*x = -3 // : 3/8
x = -3/3/8
x = -8
x = -8
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