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a in (-oo:+oo)
36 = 3*a+a+8 // - 3*a+a+8
36-(3*a)-a-8 = 0
36-3*a-a-8 = 0
28-4*a = 0 // - 28
-4*a = -28 // : -4
a = -28/(-4)
a = 7
a = 7
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