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(1/2)*x+10 = 81/8 // - 81/8
(1/2)*x-(81/8)+10 = 0
(1/2)*x-81/8+10 = 0
1/2*x-1/8 = 0 // + 1/8
1/2*x = 1/8 // : 1/2
x = 1/8/1/2
x = 1/4
x = 1/4
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