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u in (-oo:+oo)
(8*u)/4+(3*u)/3 = u-14 // - u-14
(8*u)/4+(3*u)/3-u+14 = 0
2*u+14 = 0 // - 14
2*u = -14 // : 2
u = -14/2
u = -7
u = -7
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