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a in (-oo:+oo)
a+2 = 5*a-30 // - 5*a-30
a-(5*a)+2+30 = 0
a-5*a+2+30 = 0
32-4*a = 0 // - 32
-4*a = -32 // : -4
a = -32/(-4)
a = 8
a = 8
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