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7*x-(9/4) = 10 // - 10
7*x-(9/4)-10 = 0
7*x-9/4-10 = 0
7*x-49/4 = 0 // + 49/4
7*x = 49/4 // : 7
x = 49/4/7
x = 7/4
x = 7/4
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