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x in (-oo:+oo)
(-7/8)*x = -1/3 // + -1/3
(-7/8)*x-(-1/3) = 0
(-7/8)*x+1/3 = 0
1/3-7/8*x = 0 // - 1/3
-7/8*x = -1/3 // : -7/8
x = -1/3/(-7/8)
x = 8/21
x = 8/21
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