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x in (-oo:+oo)
7*x-(3/4) = 9 // - 9
7*x-(3/4)-9 = 0
7*x-3/4-9 = 0
7*x-39/4 = 0 // + 39/4
7*x = 39/4 // : 7
x = 39/4/7
x = 39/28
x = 39/28
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