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2*x-(81/2) = 291/2 // - 291/2
2*x-(81/2)-(291/2) = 0
2*x-81/2-291/2 = 0
2*x-186 = 0 // + 186
2*x = 186 // : 2
x = 186/2
x = 93
x = 93
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