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(2*x-3)/5 = (4*x)/7 // - (4*x)/7
(2*x-3)/5-((4*x)/7) = 0
(2*x-3)/5+(-4/7)*x = 0
(2*x-3)/5+(-4*x)/7 = 0
(7*(2*x-3))/(5*7)+(-4*5*x)/(5*7) = 0
7*(2*x-3)-4*5*x = 0
-6*x-21 = 0
(-6*x-21)/(5*7) = 0
(-6*x-21)/(5*7) = 0 // * 5*7
-6*x-21 = 0
-6*x-21 = 0 // + 21
-6*x = 21 // : -6
x = 21/(-6)
x = -7/2
x = -7/2
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