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(1/2)*(x+3) = 18 // - 18
(1/2)*(x+3)-18 = 0
1/2*(x+3)-18 = 0
1/2*(x+3)-18 = 0
1/2*x-33/2 = 0
1/2*x-33/2 = 0
1/2*x-33/2 = 0 // + 33/2
1/2*x = 33/2 // : 1/2
x = 33/2/1/2
x = 33
x = 33
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