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2*((1/2)*x-5)+4*x = 0
2*(1/2*x-5)+4*x = 0
2*(1/2*x-5)+4*x = 0
5*x-10 = 0
5*x-10 = 0
5*x-10 = 0 // + 10
5*x = 10 // : 5
x = 10/5
x = 2
x = 2
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