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6*(x-8) = (1/2)*(x-(3*7)) // - (1/2)*(x-(3*7))
6*(x-8)-((1/2)*(x-(3*7))) = 0
6*(x-8)+(-1/2)*(x-21) = 0
6*(x-8)-1/2*(x-21) = 0
6*(x-8)-1/2*(x-21) = 0
11/2*x-75/2 = 0
11/2*x-75/2 = 0
11/2*x-75/2 = 0 // + 75/2
11/2*x = 75/2 // : 11/2
x = 75/2/11/2
x = 75/11
x = 75/11
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