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(3/4)*(4*x+8) = 20 // - 20
(3/4)*(4*x+8)-20 = 0
3/4*(4*x+8)-20 = 0
3/4*(4*x+8)-20 = 0
3*x-14 = 0
3*x-14 = 0
3*x-14 = 0 // + 14
3*x = 14 // : 3
x = 14/3
x = 14/3
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