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x in (-oo:+oo)
x/64 = 81/72 // - 81/72
x/64-(81/72) = 0
x/64-9/8 = 0
1/64*x-9/8 = 0 // + 9/8
1/64*x = 9/8 // : 1/64
x = 9/8/1/64
x = 72
x = 72
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