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