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a in (-oo:+oo)
5*a+1 = -7*a-59 // + -7*a-59
5*a-(-7*a)+1+59 = 0
5*a+7*a+1+59 = 0
12*a+60 = 0 // - 60
12*a = -60 // : 12
a = -60/12
a = -5
a = -5
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