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