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11 = (12-x)/a // - (12-x)/a
11-((12-x)/a) = 0
(-1*(12-x))/a+11 = 0
(-1*(12-x))/a+(11*a)/a = 0
11*a-1*(12-x) = 0
11*a+x-12 = 0
(11*a+x-12)/a = 0
(11*a+x-12)/a = 0 // * a
11*a+x-12 = 0
11*a+x-12 = 0 // - 11*a-12
x = -(11*a-12)
x = 12-(11*a)
x = 12-(11*a)
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