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x in (-oo:+oo)
98 = 28*(x/2) // - 28*(x/2)
98-(28*(x/2)) = 0
98-14*x = 0
98-14*x = 0 // - 98
-14*x = -98 // : -14
x = -98/(-14)
x = 7
x = 7
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