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(1/5)*(2*x-1) = 8 // - 8
(1/5)*(2*x-1)-8 = 0
1/5*(2*x-1)-8 = 0
1/5*(2*x-1)-8 = 0
2/5*x-41/5 = 0
2/5*x-41/5 = 0
2/5*x-41/5 = 0 // + 41/5
2/5*x = 41/5 // : 2/5
x = 41/5/2/5
x = 41/2
x = 41/2
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