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x in (-oo:+oo)
(5*x)/3+2 = (7*x+1)/4 // - (7*x+1)/4
(5*x)/3-((7*x+1)/4)+2 = 0
(-1*(7*x+1))/4+(5*x)/3+2 = 0
(-1*3*(7*x+1))/(3*4)+(4*5*x)/(3*4)+(2*3*4)/(3*4) = 0
4*5*x-1*3*(7*x+1)+2*3*4 = 0
24-x-3 = 0
21-x = 0
(21-x)/(3*4) = 0
(21-x)/(3*4) = 0 // * 3*4
21-x = 0
21-x = 0 // - 21
-x = -21 // * -1
x = 21
x = 21
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