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x in (-oo:+oo)
(2/5)*x+4 = 8/5 // - 8/5
(2/5)*x-(8/5)+4 = 0
(2/5)*x-8/5+4 = 0
2/5*x+12/5 = 0 // - 12/5
2/5*x = -12/5 // : 2/5
x = -12/5/2/5
x = -6
x = -6
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