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x in (-oo:+oo)
(x-4)/3-((2*x+1)/7) = (5*x-1)/2 // - (5*x-1)/2
(x-4)/3-((2*x+1)/7)-((5*x-1)/2) = 0
(x-4)/3+(-1*(2*x+1))/7+(-1*(5*x-1))/2 = 0
(2*7*(x-4))/(2*3*7)+(-1*2*3*(2*x+1))/(2*3*7)+(-1*3*7*(5*x-1))/(2*3*7) = 0
2*7*(x-4)-1*2*3*(2*x+1)-1*3*7*(5*x-1) = 0
2*x-105*x-62+21 = 0
-103*x-41 = 0
(-103*x-41)/(2*3*7) = 0
(-103*x-41)/(2*3*7) = 0 // * 2*3*7
-103*x-41 = 0
-103*x-41 = 0 // + 41
-103*x = 41 // : -103
x = 41/(-103)
x = -41/103
x = -41/103
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