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<h2>B) ( 9 + 12a ) + ( 3a + 7 ) = 76</h2>
</h3>
Let us solve this equation :-
<h3>= ( 9 + 12a ) + ( 3a + 7 ) = 76</h3><h3>= 9 + 15a + 7 = 76</h3><h3>= 16 + 15a = 76</h3><h3>Let us check whether it is correct or not :-
= ( 9 + 12 × 4 ) + ( 3 × 4 + 7 ) = 76
= 57 + 19 = 76°
Therefore , the correct option is :-
<h2>B) ( 9 + 12a ) + ( 3a + 7 ) = 76</h2>