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x in (-oo:+oo)
2/3 = (7/8)*x // - (7/8)*x
2/3-((7/8)*x) = 0
(-7/8)*x+2/3 = 0
2/3-7/8*x = 0 // - 2/3
-7/8*x = -2/3 // : -7/8
x = -2/3/(-7/8)
x = 16/21
x = 16/21
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