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(x+3)/2+x/5 = 4 // - 4
(x+3)/2+x/5-4 = 0
(5*(x+3))/(2*5)+(2*x)/(2*5)+(-4*2*5)/(2*5) = 0
5*(x+3)+2*x-4*2*5 = 0
7*x-40+15 = 0
7*x-25 = 0
(7*x-25)/(2*5) = 0
(7*x-25)/(2*5) = 0 // * 2*5
7*x-25 = 0
7*x-25 = 0 // + 25
7*x = 25 // : 7
x = 25/7
x = 25/7
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