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x in (-oo:+oo)
4 = 2-((3/5)*x) // - 2-((3/5)*x)
(3/5)*x-2+4 = 0
3/5*x+2 = 0 // - 2
3/5*x = -2 // : 3/5
x = -2/3/5
x = -10/3
x = -10/3
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