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x in (-oo:+oo)
6-((2/5)*x) = 10 // - 10
6-((2/5)*x)-10 = 0
(-2/5)*x-10+6 = 0
-2/5*x-4 = 0 // + 4
-2/5*x = 4 // : -2/5
x = 4/(-2/5)
x = -10
x = -10
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