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(5*x-(4*x))/7 = 6*x-(3*x)-5 // - 6*x-(3*x)-5
(5*x-(4*x))/7-(6*x)+3*x+5 = 0
(5*x-4*x)/7-6*x+3*x+5 = 0
x/7-6*x+3*x+5 = 0
x/7+(-6*7*x)/7+(3*7*x)/7+(5*7)/7 = 0
x-6*7*x+3*7*x+5*7 = 0
21*x-41*x+35 = 0
35-20*x = 0
(35-20*x)/7 = 0
(35-20*x)/7 = 0 // * 7
35-20*x = 0
35-20*x = 0 // - 35
-20*x = -35 // : -20
x = -35/(-20)
x = 7/4
x = 7/4
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