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x in (-oo:+oo)
x/63 = 4/9 // - 4/9
x/63-(4/9) = 0
x/63-4/9 = 0
1/63*x-4/9 = 0 // + 4/9
1/63*x = 4/9 // : 1/63
x = 4/9/1/63
x = 28
x = 28
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