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x in (-oo:+oo)
x/9 = 40/5 // - 40/5
x/9-(40/5) = 0
x/9-8 = 0
1/9*x-8 = 0 // + 8
1/9*x = 8 // : 1/9
x = 8/1/9
x = 72
x = 72
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