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x in (-oo:+oo)
2/5-((3/8)*x) = -11/10 // + -11/10
2/5-((3/8)*x)-(-11/10) = 0
(-3/8)*x+2/5+11/10 = 0
3/2-3/8*x = 0 // - 3/2
-3/8*x = -3/2 // : -3/8
x = -3/2/(-3/8)
x = 4
x = 4
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