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(1/7)*(2*x-5) = (3/8)*x-(5/7) // - (3/8)*x-(5/7)
(1/7)*(2*x-5)-((3/8)*x)+5/7 = 0
(1/7)*(2*x-5)+(-3/8)*x+5/7 = 0
1/7*(2*x-5)+(-3*x)/8+5/7 = 0
(1/7*7*8*(2*x-5))/(7*8)+(-3*7*x)/(7*8)+(5*8)/(7*8) = 0
1/7*7*8*(2*x-5)-3*7*x+5*8 = 0
40-5*x-40 = 0
-5*x = 0
(-5*x)/(7*8) = 0
(-5*x)/(7*8) = 0 // * 7*8
-5*x = 0
-5*x = 0 // : -5
x = 0
x = 0
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