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x in (-oo:+oo)
x/7 = 9/2 // - 9/2
x/7-(9/2) = 0
x/7-9/2 = 0
1/7*x-9/2 = 0 // + 9/2
1/7*x = 9/2 // : 1/7
x = 9/2/1/7
x = 63/2
x = 63/2
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