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x in (-oo:+oo)
7/8 = x/12 // - x/12
7/8-(x/12) = 0
7/8-1/12*x = 0 // - 7/8
-1/12*x = -7/8 // : -1/12
x = -7/8/(-1/12)
x = 21/2
x = 21/2
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