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x in (-oo:+oo)
9/4 = x/16 // - x/16
9/4-(x/16) = 0
9/4-1/16*x = 0 // - 9/4
-1/16*x = -9/4 // : -1/16
x = -9/4/(-1/16)
x = 36
x = 36
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