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(1/2)*(10*x-1) = 7 // - 7
(1/2)*(10*x-1)-7 = 0
1/2*(10*x-1)-7 = 0
1/2*(10*x-1)-7 = 0
5*x-15/2 = 0
5*x-15/2 = 0
5*x-15/2 = 0 // + 15/2
5*x = 15/2 // : 5
x = 15/2/5
x = 3/2
x = 3/2
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