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x in (-oo:+oo)
(1/2)*(x-3) = 5 // - 5
(1/2)*(x-3)-5 = 0
1/2*(x-3)-5 = 0
1/2*(x-3)-5 = 0
1/2*x-13/2 = 0
1/2*x-13/2 = 0
1/2*x-13/2 = 0 // + 13/2
1/2*x = 13/2 // : 1/2
x = 13/2/1/2
x = 13
x = 13
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