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(1/2)*(10*x-5) = 3 // - 3
(1/2)*(10*x-5)-3 = 0
1/2*(10*x-5)-3 = 0
1/2*(10*x-5)-3 = 0
5*x-11/2 = 0
5*x-11/2 = 0
5*x-11/2 = 0 // + 11/2
5*x = 11/2 // : 5
x = 11/2/5
x = 11/10
x = 11/10
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