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c in (-oo:+oo)
(3*c)/4 = 3*c-36 // - 3*c-36
(3*c)/4-(3*c)+36 = 0
(3*c)/4-3*c+36 = 0
36-9/4*c = 0 // - 36
-9/4*c = -36 // : -9/4
c = -36/(-9/4)
c = 16
c = 16
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