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(1/2)*(10*x-4) = 13 // - 13
(1/2)*(10*x-4)-13 = 0
1/2*(10*x-4)-13 = 0
1/2*(10*x-4)-13 = 0
5*x-15 = 0
5*x-15 = 0
5*x-15 = 0 // + 15
5*x = 15 // : 5
x = 15/5
x = 3
x = 3
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