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a in (-oo:+oo)
-28 = 3*a-6*a+5 // - 3*a-6*a+5
-(-6*a)-(3*a)-28-5 = 0
6*a-3*a-28-5 = 0
3*a-33 = 0 // + 33
3*a = 33 // : 3
a = 33/3
a = 11
a = 11
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