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x in (-oo:+oo)
x/9 = 7/4 // - 7/4
x/9-(7/4) = 0
x/9-7/4 = 0
1/9*x-7/4 = 0 // + 7/4
1/9*x = 7/4 // : 1/9
x = 7/4/1/9
x = 63/4
x = 63/4
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