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x in (-oo:+oo)
x-(2/5) = 10-((2*x)/3) // - 10-((2*x)/3)
x+(2*x)/3-(2/5)-10 = 0
x+(2*x)/3-2/5-10 = 0
5/3*x-52/5 = 0 // + 52/5
5/3*x = 52/5 // : 5/3
x = 52/5/5/3
x = 156/25
x = 156/25
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