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x in (-oo:+oo)
-0.8889 = (-8/9)*x+8 // - (-8/9)*x+8
-((-8/9)*x)-8-0.8889 = 0
(8/9)*x-8-0.8889 = 0
8/9*x-8.8889 = 0 // + 8.8889
8/9*x = 8.8889 // : 8/9
x = 8.8889/8/9
x = 10.00001249
x = 10.00001249
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