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(1/8)*(5*x+4) = 3.4 // - 3.4
(1/8)*(5*x+4)-3.4 = 0
1/8*(5*x+4)-3.4 = 0
1/8*(5*x+4)-3.4 = 0
5/8*x-2.9 = 0
5/8*x-2.9 = 0
5/8*x-2.9 = 0 // + 2.9
5/8*x = 2.9 // : 5/8
x = 2.9/5/8
x = 4.64
x = 4.64
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