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(3*(5*x+4))/2+7*x-8 = 0
(3*(5*x+4))/2+(2*7*x)/2+(-8*2)/2 = 0
3*(5*x+4)+2*7*x-8*2 = 0
29*x-16+12 = 0
29*x-4 = 0
(29*x-4)/2 = 0
(29*x-4)/2 = 0 // * 2
29*x-4 = 0
29*x-4 = 0 // + 4
29*x = 4 // : 29
x = 4/29
x = 4/29
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