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