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(3*x-5)/4 = -5/7 // + -5/7
(3*x-5)/4-(-5/7) = 0
(3*x-5)/4+5/7 = 0
(7*(3*x-5))/(4*7)+(4*5)/(4*7) = 0
7*(3*x-5)+4*5 = 0
21*x-15 = 0
(21*x-15)/(4*7) = 0
(21*x-15)/(4*7) = 0 // * 4*7
21*x-15 = 0
21*x-15 = 0 // + 15
21*x = 15 // : 21
x = 15/21
x = 5/7
x = 5/7
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