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(2*x+1)/5+(4-x)/3 = 1/15 // - 1/15
(2*x+1)/5+(4-x)/3-(1/15) = 0
(2*x+1)/5+(4-x)/3-1/15 = 0
(3*15*(2*x+1))/(3*5*15)+(5*15*(4-x))/(3*5*15)+(-1*3*5)/(3*5*15) = 0
3*15*(2*x+1)+5*15*(4-x)-1*3*5 = 0
15*x-15+345 = 0
15*x+330 = 0
(15*x+330)/(3*5*15) = 0
(15*x+330)/(3*5*15) = 0 // * 3*5*15
15*x+330 = 0
15*x+330 = 0 // - 330
15*x = -330 // : 15
x = -330/15
x = -22
x = -22
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