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x in (-oo:+oo)
(-8/9)*x = 7/12 // - 7/12
(-8/9)*x-(7/12) = 0
(-8/9)*x-7/12 = 0
-8/9*x-7/12 = 0 // + 7/12
-8/9*x = 7/12 // : -8/9
x = 7/12/(-8/9)
x = -21/32
x = -21/32
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