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