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3*x-(11/2) = 71 // - 71
3*x-(11/2)-71 = 0
3*x-11/2-71 = 0
3*x-153/2 = 0 // + 153/2
3*x = 153/2 // : 3
x = 153/2/3
x = 51/2
x = 51/2
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