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(3/4)*((4/5)*x-2) = 3 // - 3
(3/4)*((4/5)*x-2)-3 = 0
3/4*(4/5*x-2)-3 = 0
3/4*(4/5*x-2)-3 = 0
3/5*x-9/2 = 0
3/5*x-9/2 = 0
3/5*x-9/2 = 0 // + 9/2
3/5*x = 9/2 // : 3/5
x = 9/2/3/5
x = 15/2
x = 15/2
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