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x in (-oo:+oo)
69/4 = (1/2)*x // - (1/2)*x
69/4-((1/2)*x) = 0
(-1/2)*x+69/4 = 0
69/4-1/2*x = 0 // - 69/4
-1/2*x = -69/4 // : -1/2
x = -69/4/(-1/2)
x = 69/2
x = 69/2
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