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2*((1/2)*x-5) = 20 // - 20
2*((1/2)*x-5)-20 = 0
2*(1/2*x-5)-20 = 0
2*(1/2*x-5)-20 = 0
x-30 = 0
x-30 = 0
x-30 = 0 // + 30
x = 30
x = 30
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