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x in (-oo:+oo)
(3/5)*x-(2/5) = -4 // + 4
(3/5)*x-(2/5)+4 = 0
(3/5)*x-2/5+4 = 0
3/5*x+18/5 = 0 // - 18/5
3/5*x = -18/5 // : 3/5
x = -18/5/3/5
x = -6
x = -6
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