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x in (-oo:+oo)
2/5 = (6*x)/10 // - (6*x)/10
2/5-((6*x)/10) = 0
(-3/5)*x+2/5 = 0
2/5-3/5*x = 0 // - 2/5
-3/5*x = -2/5 // : -3/5
x = -2/5/(-3/5)
x = 2/3
x = 2/3
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