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x in (-oo:+oo)
7*x+6*x-(5/8) = 5/8 // - 5/8
7*x+6*x-(5/8)-(5/8) = 0
7*x+6*x-5/8-5/8 = 0
13*x-5/4 = 0 // + 5/4
13*x = 5/4 // : 13
x = 5/4/13
x = 5/52
x = 5/52
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