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x in (-oo:+oo)
(-7/8)*x = -21/32 // + -21/32
(-7/8)*x-(-21/32) = 0
(-7/8)*x+21/32 = 0
21/32-7/8*x = 0 // - 21/32
-7/8*x = -21/32 // : -7/8
x = -21/32/(-7/8)
x = 3/4
x = 3/4
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