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(1/2)*(2*x+40) = 5*x // - 5*x
(1/2)*(2*x+40)-(5*x) = 0
(1/2)*(2*x+40)-5*x = 0
1/2*(2*x+40)-5*x = 0
1/2*(2*x+40)-5*x = 0
20-4*x = 0
20-4*x = 0
20-4*x = 0 // - 20
-4*x = -20 // : -4
x = -20/(-4)
x = 5
x = 5
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