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c in (-oo:+oo)
(-10/12)*c = -15/28 // + -15/28
(-10/12)*c-(-15/28) = 0
(-10/12)*c+15/28 = 0
15/28-5/6*c = 0 // - 15/28
-5/6*c = -15/28 // : -5/6
c = -15/28/(-5/6)
c = 9/14
c = 9/14
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