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x in (-oo:+oo)
x+(2/5)*x+5 = -52/5 // + -52/5
x+(2/5)*x-(-52/5)+5 = 0
x+(2/5)*x+52/5+5 = 0
7/5*x+77/5 = 0 // - 77/5
7/5*x = -77/5 // : 7/5
x = -77/5/7/5
x = -11
x = -11
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