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2.9*(x-5) = (1/5)*x-4 // - (1/5)*x-4
2.9*(x-5)-((1/5)*x)+4 = 0
2.9*(x-5)+(-1/5)*x+4 = 0
2.9*(x-5)-x/5+4 = 0
(2.9*5*(x-5))/5-x/5+(4*5)/5 = 0
2.9*5*(x-5)-x+4*5 = 0
13.5*x-72.5+20 = 0
13.5*x-52.5 = 0
(13.5*x-52.5)/5 = 0
(13.5*x-52.5)/5 = 0 // * 5
13.5*x-52.5 = 0
13.5*x-52.5 = 0 // + 52.5
13.5*x = 52.5 // : 13.5
x = 52.5/13.5
x = 3.88888889
x = 3.88888889
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