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x in (-oo:+oo)
(1/2)*x+3 = 13/2 // - 13/2
(1/2)*x-(13/2)+3 = 0
(1/2)*x-13/2+3 = 0
1/2*x-7/2 = 0 // + 7/2
1/2*x = 7/2 // : 1/2
x = 7/2/1/2
x = 7
x = 7
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