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x in (-oo:+oo)
7*x-(3/4) = 9/2 // - 9/2
7*x-(3/4)-(9/2) = 0
7*x-3/4-9/2 = 0
7*x-21/4 = 0 // + 21/4
7*x = 21/4 // : 7
x = 21/4/7
x = 3/4
x = 3/4
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