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x in (-oo:+oo)
42/12 = x/4 // - x/4
42/12-(x/4) = 0
7/2-1/4*x = 0 // - 7/2
-1/4*x = -7/2 // : -1/4
x = -7/2/(-1/4)
x = 14
x = 14
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