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x in (-oo:+oo)
5*x = 3/8+4/7 // - 3/8+4/7
5*x-(3/8)-(4/7) = 0
5*x-3/8-4/7 = 0
5*x-53/56 = 0 // + 53/56
5*x = 53/56 // : 5
x = 53/56/5
x = 53/280
x = 53/280
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