(с/3+d/6)*3=(2c/6+d/6)*3=(2c+d)/6*3=(2c+d)/2=2c/2+d/2=(c+d)/2
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(с/3+d/6)*3=(2c/6+d/6)*3=(2c+d)/6*3=(2c+d)/2=2c/2+d/2=(c+d)/2