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a in (-oo:+oo)
2*a-5 = -10/3 // + -10/3
2*a-(-10/3)-5 = 0
2*a+10/3-5 = 0
2*a-5/3 = 0 // + 5/3
2*a = 5/3 // : 2
a = 5/3/2
a = 5/6
a = 5/6
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