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x in (-oo:+oo)
3*x+1/5 = -13/10 // + -13/10
3*x+1/5-(-13/10) = 0
3*x+1/5+13/10 = 0
3*x+3/2 = 0 // - 3/2
3*x = -3/2 // : 3
x = -3/2/3
x = -1/2
x = -1/2
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