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x in (-oo:+oo)
x/9 = 42/54 // - 42/54
x/9-(42/54) = 0
x/9-7/9 = 0
1/9*x-7/9 = 0 // + 7/9
1/9*x = 7/9 // : 1/9
x = 7/9/1/9
x = 7
x = 7
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