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x in (-oo:+oo)
6/10 = (3*x)/40 // - (3*x)/40
6/10-((3*x)/40) = 0
(-3/40)*x+6/10 = 0
3/5-3/40*x = 0 // - 3/5
-3/40*x = -3/5 // : -3/40
x = -3/5/(-3/40)
x = 8
x = 8
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