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x in (-oo:+oo)
(1/2)*x+1 = 13/22 // - 13/22
(1/2)*x-(13/22)+1 = 0
(1/2)*x-13/22+1 = 0
1/2*x+9/22 = 0 // - 9/22
1/2*x = -9/22 // : 1/2
x = -9/22/1/2
x = -9/11
x = -9/11
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