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x in (-oo:+oo)
(5/7)*x-(2*x) = -9/7 // + -9/7
(5/7)*x-(2*x)-(-9/7) = 0
(5/7)*x-2*x+9/7 = 0
9/7-9/7*x = 0 // - 9/7
-9/7*x = -9/7 // : -9/7
x = -9/7/(-9/7)
x = 1
x = 1
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