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x in (-oo:+oo)
(8/5)*x+2/5 = -12 // + 12
(8/5)*x+2/5+12 = 0
8/5*x+62/5 = 0 // - 62/5
8/5*x = -62/5 // : 8/5
x = -62/5/8/5
x = -31/4
x = -31/4
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