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c in (-oo:+oo)
2*(45*c+15)+(5/6)*(18*c+12) = 0
2*(45*c+15)+5/6*(18*c+12) = 0
2*(45*c+15)+5/6*(18*c+12) = 0
105*c+40 = 0
105*c+40 = 0
105*c+40 = 0 // - 40
105*c = -40 // : 105
c = -40/105
c = -8/21
c = -8/21
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