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a(b + c) =ab + ac
Resolver.
a)
3(x + 7) = 0
(3*x + 3*7) = 0
3x + 21 = 0
3x = - 21
x = - 21/3
x = - 7
3 . x + 3 . 7
3x + 21
Respuesta :
3x + 21