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3*X-((2*X)/5) = (3*x)/10+14 // - (3*x)/10+14
3*X-((2*X)/5)-((3*x)/10)-14 = 0
3*X+(-2/5)*X+(-3/10)*x-14 = 0
13/5*X-3/10*x-14 = 0 // - 13/5*X-14
-3/10*x = -(13/5*X-14) // : -3/10
x = (-(13/5*X-14))/(-3/10)
x = -10/3*(14-(13/5*X))
x = -10/3*(14-(13/5*X))
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