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a in (-oo:+oo)
a/2+1/3 = 17 // - 17
a/2+1/3-17 = 0
1/2*a-50/3 = 0 // + 50/3
1/2*a = 50/3 // : 1/2
a = 50/3/1/2
a = 100/3
a = 100/3
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