Respuesta :

olumideolawoyin

Answer:

2( m + n ) + 7

Step-by-step explanation:

(m + n + 3) + (m + n + 4) Open the brackets by multiplying by +1

= m + n + 3 + m + n + 4 Collect like terms

= m + m + n + n + 3 + 4

= 2m + 2n + 7

= 2( m + n ) + 7

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