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x in (-oo:+oo)
(-7/8)*x = -9/10 // + -9/10
(-7/8)*x-(-9/10) = 0
(-7/8)*x+9/10 = 0
9/10-7/8*x = 0 // - 9/10
-7/8*x = -9/10 // : -7/8
x = -9/10/(-7/8)
x = 36/35
x = 36/35
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