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(2*x)/4-x = x/16-(9/4) // - x/16-(9/4)
(2*x)/4-x-(x/16)+9/4 = 0
9/4-9/16*x = 0 // - 9/4
-9/16*x = -9/4 // : -9/16
x = -9/4/(-9/16)
x = 4
x = 4
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