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x in (-oo:+oo)
(1/2)*(2/3)-((3/4)*(-1/5)) = x // - x
(1/2)*(2/3)-x-((3/4)*(-1/5)) = 0
(1/2)*(2/3)-x+3/20 = 0
29/60-x = 0 // - 29/60
-x = -29/60 // * -1
x = 29/60
x = 29/60
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