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(x+2)/5+(x-1)/2 = 0
(2*(x+2))/(2*5)+(5*(x-1))/(2*5) = 0
2*(x+2)+5*(x-1) = 0
7*x-1 = 0
(7*x-1)/(2*5) = 0
(7*x-1)/(2*5) = 0 // * 2*5
7*x-1 = 0
7*x-1 = 0 // + 1
7*x = 1 // : 7
x = 1/7
x = 1/7
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