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c in (-oo:+oo)
(2/3)*(6*c-12)+(1/2)*(8*c-12) = 22-c // - 22-c
(2/3)*(6*c-12)+(1/2)*(8*c-12)+c-22 = 0
2/3*(6*c-12)+1/2*(8*c-12)+c-22 = 0
2/3*(6*c-12)+1/2*(8*c-12)+c-22 = 0
8*c+c-22-14 = 0
9*c-22-14 = 0
9*c-36 = 0
9*c-36 = 0
9*c-36 = 0 // + 36
9*c = 36 // : 9
c = 36/9
c = 4
c = 4
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