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(x+3)/2+15 = 0
(x+3)/2+(2*15)/2 = 0
x+2*15+3 = 0
x+33 = 0
(x+33)/2 = 0
(x+33)/2 = 0 // * 2
x+33 = 0
x+33 = 0 // - 33
x = -33
x = -33
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