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x in (-oo:+oo)
-10 = (2/5)*x-4 // - (2/5)*x-4
4-((2/5)*x)-10 = 0
(-2/5)*x-10+4 = 0
-2/5*x-6 = 0 // + 6
-2/5*x = 6 // : -2/5
x = 6/(-2/5)
x = -15
x = -15
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