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(1/8)*((5/1)*x+4/1) = 3/4 // - 3/4
(1/8)*((5/1)*x+4/1)-(3/4) = 0
(1/8)*(5*x+4)-3/4 = 0
1/8*(5*x+4)-3/4 = 0
(1/8*4*(5*x+4))/4-3/4 = 0
1/8*4*(5*x+4)-3 = 0
5/2*x-1 = 0
(5/2*x-1)/4 = 0
(5/2*x-1)/4 = 0 // * 4
5/2*x-1 = 0
5/2*x-1 = 0 // + 1
5/2*x = 1 // : 5/2
x = 1/5/2
x = 2/5
x = 2/5
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