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