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x in (-oo:+oo)
(1/7)*x = -4/5 // + -4/5
(1/7)*x-(-4/5) = 0
(1/7)*x+4/5 = 0
1/7*x+4/5 = 0 // - 4/5
1/7*x = -4/5 // : 1/7
x = -4/5/1/7
x = -28/5
x = -28/5
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