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(3/5)*(30*x-15) = 72 // - 72
(3/5)*(30*x-15)-72 = 0
3/5*(30*x-15)-72 = 0
3/5*(30*x-15)-72 = 0
18*x-81 = 0
18*x-81 = 0
18*x-81 = 0 // + 81
18*x = 81 // : 18
x = 81/18
x = 9/2
x = 9/2
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