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x in (-oo:+oo)
(-5/7)*x-2 = -9 // + 9
(-5/7)*x-2+9 = 0
7-5/7*x = 0 // - 7
-5/7*x = -7 // : -5/7
x = -7/(-5/7)
x = 49/5
x = 49/5
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