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(1/2)*(8*x-b) = 25 // - 25
(1/2)*(8*x-b)-25 = 0
1/2*(8*x-b)-25 = 0
1/2*(8*x-b)-25 = 0
4*x-1/2*b-25 = 0
4*x-1/2*b-25 = 0
4*x-1/2*b-25 = 0 // + -1/2*b-25
4*x = -(-1/2*b-25) // : 4
x = (-(-1/2*b-25))/4
x = (25-(-1/2*b))/4
x = (25-(-1/2*b))/4
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