your expression is this...
n+5=3+12
n+5=15
n=10
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12 divided by 4 plus 2 times 3 = 9
36
In math problems without punctuation such as brackets, the standard convention in to solve from left to right. Therefore, you would solve the problem 15-3 times 4 plus nine like by three actions. 15-3 equals 12; 12 times 4 equals 48; 48 plus 9 equals 57.
12
20 = 400