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7*x+4/6 = 5*x-(8/7) // - 5*x-(8/7)
7*x-(5*x)+4/6+8/7 = 0
7*x-5*x+4/6+8/7 = 0
(7-5)*x+2/3+8/7 = 0 // - 2/3+8/7
(7-5)*x = -(2/3+8/7) // : 7-5
x = (-(2/3+8/7))/(7-5)
x = -((2/3+8/7)*(7-5)^-1)
x = -((2/3+8/7)*(7-5)^-1)
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