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a in (-oo:+oo)
7*a+5 = -2*a-94 // + -2*a-94
7*a-(-2*a)+5+94 = 0
7*a+2*a+5+94 = 0
9*a+99 = 0 // - 99
9*a = -99 // : 9
a = -99/9
a = -11
a = -11
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