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(1/2)*(10*x-2) = 8 // - 8
(1/2)*(10*x-2)-8 = 0
1/2*(10*x-2)-8 = 0
1/2*(10*x-2)-8 = 0
5*x-9 = 0
5*x-9 = 0
5*x-9 = 0 // + 9
5*x = 9 // : 5
x = 9/5
x = 9/5
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