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(X/16)/4 = (x/7)/3 // - (x/7)/3
(X/16)/4-((x/7)/3) = 0
(X/16)/4+(-1/21)*x = 0
1/64*X-1/21*x = 0 // - 1/64*X
-1/21*x = -(1/64*X) // : -1/21
x = (-(1/64*X))/(-1/21)
x = 21/64*X
x = 21/64*X
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