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2*(x-5)+(1/2)*x = 0
2*(x-5)+x/2 = 0
(2^2*(x-5))/2+x/2 = 0
2^2*(x-5)+x = 0
5*x-20 = 0
(5*x-20)/2 = 0
(5*x-20)/2 = 0 // * 2
5*x-20 = 0
5*x-20 = 0 // + 20
5*x = 20 // : 5
x = 20/5
x = 4
x = 4
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