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x in (-oo:+oo)
15/8 = x/3 // - x/3
15/8-(x/3) = 0
15/8-1/3*x = 0 // - 15/8
-1/3*x = -15/8 // : -1/3
x = -15/8/(-1/3)
x = 45/8
x = 45/8
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