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x in (-oo:+oo)
(4/7)*x = -8/63 // + -8/63
(4/7)*x-(-8/63) = 0
(4/7)*x+8/63 = 0
4/7*x+8/63 = 0 // - 8/63
4/7*x = -8/63 // : 4/7
x = -8/63/4/7
x = -2/9
x = -2/9
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