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(1/2)*x-5 = 3*x-10 // - 3*x-10
(1/2)*x-(3*x)-5+10 = 0
(1/2)*x-3*x-5+10 = 0
5-5/2*x = 0 // - 5
-5/2*x = -5 // : -5/2
x = -5/(-5/2)
x = 2
x = 2
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