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X/5+(3*x)/10 = 6 // - 6
X/5+(3*x)/10-6 = 0
1/5*X+3/10*x-6 = 0 // - 1/5*X-6
3/10*x = -(1/5*X-6) // : 3/10
x = (-(1/5*X-6))/3/10
x = 10/3*(6-(1/5*X))
x = 10/3*(6-(1/5*X))
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