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(1/2)*(8*x-2) = 15 // - 15
(1/2)*(8*x-2)-15 = 0
1/2*(8*x-2)-15 = 0
1/2*(8*x-2)-15 = 0
4*x-16 = 0
4*x-16 = 0
4*x-16 = 0 // + 16
4*x = 16 // : 4
x = 16/4
x = 4
x = 4
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