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a in (-oo:+oo)
5*(2*a+10) = 70 // - 70
5*(2*a+10)-70 = 0
5*(2*a+10)-70 = 0
10*a-20 = 0
10*a-20 = 0
10*a-20 = 0 // + 20
10*a = 20 // : 10
a = 20/10
a = 2
a = 2
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