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x in (-oo:+oo)
3/4 = x/72 // - x/72
3/4-(x/72) = 0
3/4-1/72*x = 0 // - 3/4
-1/72*x = -3/4 // : -1/72
x = -3/4/(-1/72)
x = 54
x = 54
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