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x in (-oo:+oo)
8.7 = x/3 // - x/3
8.7-(x/3) = 0
8.7-1/3*x = 0 // - 8.7
-1/3*x = -8.7 // : -1/3
x = -8.7/(-1/3)
x = 26.10000026
x = 26.10000026
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