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c in (-oo:+oo)
(3*c)/10+c/5-(3/2) = 0
(3*c)/10+c/5-3/2 = 0
1/2*c-3/2 = 0 // + 3/2
1/2*c = 3/2 // : 1/2
c = 3/2/1/2
c = 3
c = 3
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