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x in (-oo:+oo)
x+5*x-2 = -28/5 // + -28/5
x+5*x-(-28/5)-2 = 0
x+5*x+28/5-2 = 0
6*x+18/5 = 0 // - 18/5
6*x = -18/5 // : 6
x = -18/5/6
x = -3/5
x = -3/5
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