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(2*x)/5+1/3 = (7*x-2)/15 // - (7*x-2)/15
(2*x)/5-((7*x-2)/15)+1/3 = 0
(-1*(7*x-2))/15+(2*x)/5+1/3 = 0
(-1*3*5*(7*x-2))/(3*5*15)+(2*3*15*x)/(3*5*15)+(1*5*15)/(3*5*15) = 0
2*3*15*x-1*3*5*(7*x-2)+1*5*15 = 0
30-15*x+75 = 0
105-15*x = 0
(105-15*x)/(3*5*15) = 0
(105-15*x)/(3*5*15) = 0 // * 3*5*15
105-15*x = 0
105-15*x = 0 // - 105
-15*x = -105 // : -15
x = -105/(-15)
x = 7
x = 7
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