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x in (-oo:+oo)
3*x+8/10 = x/5 // - x/5
3*x-(x/5)+8/10 = 0
14/5*x+4/5 = 0 // - 4/5
14/5*x = -4/5 // : 14/5
x = -4/5/14/5
x = -2/7
x = -2/7
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