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x in (-oo:+oo)
(1/2)*(x+8) = 18 // - 18
(1/2)*(x+8)-18 = 0
1/2*(x+8)-18 = 0
1/2*(x+8)-18 = 0
1/2*x-14 = 0
1/2*x-14 = 0
1/2*x-14 = 0 // + 14
1/2*x = 14 // : 1/2
x = 14/1/2
x = 28
x = 28
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