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a in (-oo:+oo)
5*(10-3*a) = -70 // + 70
5*(10-3*a)+70 = 0
5*(10-3*a)+70 = 0
120-15*a = 0
120-15*a = 0
120-15*a = 0 // - 120
-15*a = -120 // : -15
a = -120/(-15)
a = 8
a = 8
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