укажите, пожалуйста, верные равенства

3(4+x)= 12x
3(4+x) = 12+3x
3(4+x)= 12+x
3(4+x) = 4+3x


(15-3a)×3= 9a-45
(15-3a)×3=45-9a
(15-3a)×3=45-3a
(15-3a)×3=15-9a​
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