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(x+1)/2 = (4/5)*(x-10) // - (4/5)*(x-10)
(x+1)/2-((4/5)*(x-10)) = 0
(x+1)/2+(-4/5)*(x-10) = 0
(x+1)/2-4/5*(x-10) = 0
(x+1)/2+(-4/5*2*(x-10))/2 = 0
x-4/5*2*(x-10)+1 = 0
17-3/5*x = 0
(17-3/5*x)/2 = 0
(17-3/5*x)/2 = 0 // * 2
17-3/5*x = 0
17-3/5*x = 0 // - 17
-3/5*x = -17 // : -3/5
x = -17/(-3/5)
x = 85/3
x = 85/3
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