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(11/2)*x-(7/2) = 81/2 // - 81/2
(11/2)*x-(7/2)-(81/2) = 0
(11/2)*x-7/2-81/2 = 0
11/2*x-44 = 0 // + 44
11/2*x = 44 // : 11/2
x = 44/11/2
x = 8
x = 8
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