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10-(2*x) = (1/2)*(x-10) // - (1/2)*(x-10)
10-((1/2)*(x-10))-(2*x) = 0
(-1/2)*(x-10)-2*x+10 = 0
10-1/2*(x-10)-2*x = 0
10-1/2*(x-10)-2*x = 0
5-5/2*x+10 = 0
15-5/2*x = 0
15-5/2*x = 0
15-5/2*x = 0 // - 15
-5/2*x = -15 // : -5/2
x = -15/(-5/2)
x = 6
x = 6
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