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x in (-oo:+oo)
(5/7)*x-(2/3) = -44/21 // + -44/21
(5/7)*x-(2/3)-(-44/21) = 0
(5/7)*x-2/3+44/21 = 0
5/7*x+10/7 = 0 // - 10/7
5/7*x = -10/7 // : 5/7
x = -10/7/5/7
x = -2
x = -2
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