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x in (-oo:+oo)
(-7/8)*x = -21/61 // + -21/61
(-7/8)*x-(-21/61) = 0
(-7/8)*x+21/61 = 0
21/61-7/8*x = 0 // - 21/61
-7/8*x = -21/61 // : -7/8
x = -21/61/(-7/8)
x = 24/61
x = 24/61
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