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(1/2)*x+2/5 = 27/55 // - 27/55
(1/2)*x+2/5-(27/55) = 0
(1/2)*x+2/5-27/55 = 0
1/2*x-1/11 = 0 // + 1/11
1/2*x = 1/11 // : 1/2
x = 1/11/1/2
x = 2/11
x = 2/11
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