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