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(19/18)*X-((1/2)*x)-19 = 0
(19/18)*X+(-1/2)*x-19 = 0
19/18*X-1/2*x-19 = 0 // - 19/18*X-19
-1/2*x = -(19/18*X-19) // : -1/2
x = (-(19/18*X-19))/(-1/2)
x = -2*(19-(19/18*X))
x = -2*(19-(19/18*X))
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