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(2*x+5)/5 = -5 // + 5
(2*x+5)/5+5 = 0
(2*x+5)/5+(5^2)/5 = 0
2*x+5+25 = 0
2*x+30 = 0
(2*x+30)/5 = 0
(2*x+30)/5 = 0 // * 5
2*x+30 = 0
2*x+30 = 0 // - 30
2*x = -30 // : 2
x = -30/2
x = -15
x = -15
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