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