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(1/2)*x+4 = 9-2*x // - 9-2*x
(1/2)*x-(-2*x)-9+4 = 0
(1/2)*x+2*x-9+4 = 0
5/2*x-5 = 0 // + 5
5/2*x = 5 // : 5/2
x = 5/5/2
x = 2
x = 2
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