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c in (-oo:+oo)
(10*c)/4-(16/2) = 56/8 // - 56/8
(10*c)/4-(16/2)-(56/8) = 0
(10*c)/4-8-7 = 0
5/2*c-15 = 0 // + 15
5/2*c = 15 // : 5/2
c = 15/5/2
c = 6
c = 6
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