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x in (-oo:+oo)
(-1/2)*(x+3) = -5 // + 5
(-1/2)*(x+3)+5 = 0
5-1/2*(x+3) = 0
5-1/2*(x+3) = 0
7/2-1/2*x = 0
7/2-1/2*x = 0
7/2-1/2*x = 0 // - 7/2
-1/2*x = -7/2 // : -1/2
x = -7/2/(-1/2)
x = 7
x = 7
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