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x in (-oo:+oo)
30/12 = x/4 // - x/4
30/12-(x/4) = 0
5/2-1/4*x = 0 // - 5/2
-1/4*x = -5/2 // : -1/4
x = -5/2/(-1/4)
x = 10
x = 10
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