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x in (-oo:+oo)
x/9 = 42/63 // - 42/63
x/9-(42/63) = 0
x/9-2/3 = 0
1/9*x-2/3 = 0 // + 2/3
1/9*x = 2/3 // : 1/9
x = 2/3/1/9
x = 6
x = 6
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