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x in (-oo:+oo)
4/15-x = 1/2 // - 1/2
4/15-x-(1/2) = 0
4/15-x-1/2 = 0
-x-7/30 = 0 // + 7/30
-x = 7/30 // * -1
x = -7/30
x = -7/30
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