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