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(1/2)*(x+5) = (2/3)*(2*x-10) // - (2/3)*(2*x-10)
(1/2)*(x+5)-((2/3)*(2*x-10)) = 0
(1/2)*(x+5)+(-2/3)*(2*x-10) = 0
1/2*(x+5)-2/3*(2*x-10) = 0
1/2*(x+5)-2/3*(2*x-10) = 0
55/6-5/6*x = 0
55/6-5/6*x = 0
55/6-5/6*x = 0 // - 55/6
-5/6*x = -55/6 // : -5/6
x = -55/6/(-5/6)
x = 11
x = 11
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