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(X-7)/6-((x-15)/7) = 1 // - 1
(X-7)/6-((x-15)/7)-1 = 0
(X-7)/6+(-1*(x-15))/7-1 = 0
(7*(X-7))/(6*7)+(-1*6*(x-15))/(6*7)+(-1*6*7)/(6*7) = 0
7*(X-7)-1*6*(x-15)-1*6*7 = 0
7*X-6*x-42+41 = 0
7*X-6*x-1 = 0
(7*X-6*x-1)/(6*7) = 0
(7*X-6*x-1)/(6*7) = 0 // * 6*7
7*X-6*x-1 = 0
7*X-6*x-1 = 0 // - 7*X-1
-6*x = -(7*X-1) // : -6
x = (-(7*X-1))/(-6)
x = (1-(7*X))/(-6)
x = (1-(7*X))/(-6)
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