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(9/4)*x = 42/4 // - 42/4
(9/4)*x-(42/4) = 0
(9/4)*x-21/2 = 0
9/4*x-21/2 = 0 // + 21/2
9/4*x = 21/2 // : 9/4
x = 21/2/9/4
x = 14/3
x = 14/3
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