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c in (-oo:+oo)
c-15 = (1/2)*c+6 // - (1/2)*c+6
c-((1/2)*c)-15-6 = 0
c+(-1/2)*c-15-6 = 0
1/2*c-21 = 0 // + 21
1/2*c = 21 // : 1/2
c = 21/1/2
c = 42
c = 42
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