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x in (-oo:+oo)
x/9 = 0.75 // - 0.75
x/9-0.75 = 0
1/9*x-0.75 = 0 // + 0.75
1/9*x = 0.75 // : 1/9
x = 0.75/1/9
x = 6.75000007
x = 6.75000007
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