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(1/2)*(110-(5*x)) = 30 // - 30
(1/2)*(110-(5*x))-30 = 0
(1/2)*(110-5*x)-30 = 0
1/2*(110-5*x)-30 = 0
1/2*(110-5*x)-30 = 0
25-5/2*x = 0
25-5/2*x = 0
25-5/2*x = 0 // - 25
-5/2*x = -25 // : -5/2
x = -25/(-5/2)
x = 10
x = 10
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