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x in (-oo:+oo)
36/48 = x/4 // - x/4
36/48-(x/4) = 0
3/4-1/4*x = 0 // - 3/4
-1/4*x = -3/4 // : -1/4
x = -3/4/(-1/4)
x = 3
x = 3
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