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x in (-oo:+oo)
4/15 = x/120 // - x/120
4/15-(x/120) = 0
4/15-1/120*x = 0 // - 4/15
-1/120*x = -4/15 // : -1/120
x = -4/15/(-1/120)
x = 32
x = 32
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