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(1/2)*x+7 = 161/22 // - 161/22
(1/2)*x-(161/22)+7 = 0
(1/2)*x-161/22+7 = 0
1/2*x-7/22 = 0 // + 7/22
1/2*x = 7/22 // : 1/2
x = 7/22/1/2
x = 7/11
x = 7/11
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