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x in (-oo:+oo)
(4/5)*x = -2/7 // + -2/7
(4/5)*x-(-2/7) = 0
(4/5)*x+2/7 = 0
4/5*x+2/7 = 0 // - 2/7
4/5*x = -2/7 // : 4/5
x = -2/7/4/5
x = -5/14
x = -5/14
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