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2*x-(5/2) = (1/2)*(x-3) // - (1/2)*(x-3)
2*x-((1/2)*(x-3))-(5/2) = 0
(-1/2)*(x-3)+2*x-5/2 = 0
2*x-1/2*(x-3)-5/2 = 0
(-1/2*2*(x-3))/2+(2*2*x)/2-5/2 = 0
2*2*x-1/2*2*(x-3)-5 = 0
3*x-5+3 = 0
3*x-2 = 0
(3*x-2)/2 = 0
(3*x-2)/2 = 0 // * 2
3*x-2 = 0
3*x-2 = 0 // + 2
3*x = 2 // : 3
x = 2/3
x = 2/3
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