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a in (-oo:+oo)
5*(1*a+7) = 95 // - 95
5*(1*a+7)-95 = 0
5*(a+7)-95 = 0
5*(a+7)-95 = 0
5*a-60 = 0
5*a-60 = 0
5*a-60 = 0 // + 60
5*a = 60 // : 5
a = 60/5
a = 12
a = 12
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