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x in (-oo:+oo)
-47 = -x/9 // + -x/9
-(-x/9)-47 = 0
(1/9)*x-47 = 0
1/9*x-47 = 0 // + 47
1/9*x = 47 // : 1/9
x = 47/1/9
x = 423
x = 423
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