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(5*x+30)/2 = 8*x // - 8*x
(5*x+30)/2-(8*x) = 0
(5*x+30)/2-8*x = 0
(5*x+30)/2+(-8*2*x)/2 = 0
5*x-8*2*x+30 = 0
30-11*x = 0
(30-11*x)/2 = 0
(30-11*x)/2 = 0 // * 2
30-11*x = 0
30-11*x = 0 // - 30
-11*x = -30 // : -11
x = -30/(-11)
x = 30/11
x = 30/11
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