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a in (-oo:+oo)
2*a+5 = 13-2*a // - 13-2*a
2*a-(-2*a)-13+5 = 0
2*a+2*a-13+5 = 0
4*a-8 = 0 // + 8
4*a = 8 // : 4
a = 8/4
a = 2
a = 2
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