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4*x-(1/2) = 9*x-(7/4) // - 9*x-(7/4)
4*x-(9*x)-(1/2)+7/4 = 0
4*x-9*x-1/2+7/4 = 0
5/4-5*x = 0 // - 5/4
-5*x = -5/4 // : -5
x = -5/4/(-5)
x = 1/4
x = 1/4
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