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