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(1/2)*(x+4)-16 = 18 // - 18
(1/2)*(x+4)-18-16 = 0
1/2*(x+4)-18-16 = 0
1/2*(x+4)-18-16 = 0
1/2*x-16-16 = 0
1/2*x-32 = 0
1/2*x-32 = 0
1/2*x-32 = 0 // + 32
1/2*x = 32 // : 1/2
x = 32/1/2
x = 64
x = 64
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