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x in (-oo:+oo)
28 = (7/4)*x // - (7/4)*x
28-((7/4)*x) = 0
(-7/4)*x+28 = 0
28-7/4*x = 0 // - 28
-7/4*x = -28 // : -7/4
x = -28/(-7/4)
x = 16
x = 16
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