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x in (-oo:+oo)
10/7 = (16/9)*x // - (16/9)*x
10/7-((16/9)*x) = 0
(-16/9)*x+10/7 = 0
10/7-16/9*x = 0 // - 10/7
-16/9*x = -10/7 // : -16/9
x = -10/7/(-16/9)
x = 45/56
x = 45/56
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