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(2*x+5)/2 = 10*x // - 10*x
(2*x+5)/2-(10*x) = 0
(2*x+5)/2-10*x = 0
(2*x+5)/2+(-10*2*x)/2 = 0
2*x-10*2*x+5 = 0
5-18*x = 0
(5-18*x)/2 = 0
(5-18*x)/2 = 0 // * 2
5-18*x = 0
5-18*x = 0 // - 5
-18*x = -5 // : -18
x = -5/(-18)
x = 5/18
x = 5/18
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