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x in (-oo:+oo)
5*x-(4/7) = -8 // + 8
5*x-(4/7)+8 = 0
5*x-4/7+8 = 0
5*x+52/7 = 0 // - 52/7
5*x = -52/7 // : 5
x = -52/7/5
x = -52/35
x = -52/35
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