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x in (-oo:+oo)
78/5 = x/12 // - x/12
78/5-(x/12) = 0
78/5-1/12*x = 0 // - 78/5
-1/12*x = -78/5 // : -1/12
x = -78/5/(-1/12)
x = 936/5
x = 936/5
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