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4*x+1/2 = 89/2 // - 89/2
4*x+1/2-(89/2) = 0
4*x+1/2-89/2 = 0
4*x-44 = 0 // + 44
4*x = 44 // : 4
x = 44/4
x = 11
x = 11
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