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c in (-oo:+oo)
c/4 = -8/9 // + -8/9
c/4-(-8/9) = 0
c/4+8/9 = 0
1/4*c+8/9 = 0 // - 8/9
1/4*c = -8/9 // : 1/4
c = -8/9/1/4
c = -32/9
c = -32/9
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