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(1/2)*(x+8)-15 = -3 // + 3
(1/2)*(x+8)-15+3 = 0
1/2*(x+8)-15+3 = 0
1/2*(x+8)-15+3 = 0
1/2*x-11+3 = 0
1/2*x-8 = 0
1/2*x-8 = 0
1/2*x-8 = 0 // + 8
1/2*x = 8 // : 1/2
x = 8/1/2
x = 16
x = 16
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