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(2*x+3)/5 = (1-3*x)/7 // - (1-3*x)/7
(2*x+3)/5-((1-3*x)/7) = 0
(2*x+3)/5+(-1*(1-3*x))/7 = 0
(7*(2*x+3))/(5*7)+(-1*5*(1-3*x))/(5*7) = 0
7*(2*x+3)-1*5*(1-3*x) = 0
29*x+16 = 0
(29*x+16)/(5*7) = 0
(29*x+16)/(5*7) = 0 // * 5*7
29*x+16 = 0
29*x+16 = 0 // - 16
29*x = -16 // : 29
x = -16/29
x = -16/29
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