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X/4-(13/6) = (5*x)/2-5+6 // - (5*x)/2-5+6
X/4-((5*x)/2)-(13/6)-6+5 = 0
X/4+(-5/2)*x-13/6-6+5 = 0
1/4*X-5/2*x-19/6 = 0 // - 1/4*X-19/6
-5/2*x = -(1/4*X-19/6) // : -5/2
x = (-(1/4*X-19/6))/(-5/2)
x = -2/5*(19/6-(1/4*X))
x = -2/5*(19/6-(1/4*X))
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