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(3-x)/6 = (6-x)/12 // - (6-x)/12
(3-x)/6-((6-x)/12) = 0
(3-x)/6+(-1*(6-x))/12 = 0
(12*(3-x))/(6*12)+(-1*6*(6-x))/(6*12) = 0
12*(3-x)-1*6*(6-x) = 0
-6*x = 0
(-6*x)/(6*12) = 0
(-6*x)/(6*12) = 0 // * 6*12
-6*x = 0
-6*x = 0 // : -6
x = 0
x = 0
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