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(9/4)*x = 3/1 // - 3/1
(9/4)*x-(3/1) = 0
(9/4)*x-3 = 0
9/4*x-3 = 0 // + 3
9/4*x = 3 // : 9/4
x = 3/9/4
x = 4/3
x = 4/3
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