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(1/2)*(10*x-4) = 18 // - 18
(1/2)*(10*x-4)-18 = 0
1/2*(10*x-4)-18 = 0
1/2*(10*x-4)-18 = 0
5*x-20 = 0
5*x-20 = 0
5*x-20 = 0 // + 20
5*x = 20 // : 5
x = 20/5
x = 4
x = 4
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