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x in (-oo:+oo)
(1/2)*x+2 = 13/8 // - 13/8
(1/2)*x-(13/8)+2 = 0
(1/2)*x-13/8+2 = 0
1/2*x+3/8 = 0 // - 3/8
1/2*x = -3/8 // : 1/2
x = -3/8/1/2
x = -3/4
x = -3/4
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