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(7/2)*x = 63/4 // - 63/4
(7/2)*x-(63/4) = 0
(7/2)*x-63/4 = 0
7/2*x-63/4 = 0 // + 63/4
7/2*x = 63/4 // : 7/2
x = 63/4/7/2
x = 9/2
x = 9/2
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