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x in (-oo:+oo)
-3/5-(2/3) = x // - x
-x-3/5-(2/3) = 0
-x-3/5-2/3 = 0
-x-19/15 = 0 // + 19/15
-x = 19/15 // * -1
x = -19/15
x = -19/15
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