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a in (-oo:+oo)
5 = -((2*a)/3)-7 // + -((2*a)/3)-7
(2*a)/3+5+7 = 0
2/3*a+12 = 0 // - 12
2/3*a = -12 // : 2/3
a = -12/2/3
a = -18
a = -18
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