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x in (-oo:+oo)
4*x-(1/7) = -8/7 // + -8/7
4*x-(1/7)-(-8/7) = 0
4*x-1/7+8/7 = 0
4*x+1 = 0 // - 1
4*x = -1 // : 4
x = -1/4
x = -1/4
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