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a in (-oo:+oo)
7*a-(6*a)+5/9 = -7/36 // + -7/36
7*a-(6*a)+5/9-(-7/36) = 0
7*a-6*a+5/9+7/36 = 0
a+3/4 = 0 // - 3/4
a = -3/4
a = -3/4
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