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x in (-oo:+oo)
12/7 = x/4 // - x/4
12/7-(x/4) = 0
12/7-1/4*x = 0 // - 12/7
-1/4*x = -12/7 // : -1/4
x = -12/7/(-1/4)
x = 48/7
x = 48/7
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