From you notation, it is not clear whether the denominator is just the first of the two terms or both of them. I will first assume it is just the first number.
[10-15/(3)] (6) -12 = (-5/3)(6) - 12 = -10 - 12 = -22
Now if it is both numbers.
[10-15/(3)(6)] -12 = -5/18 - 12 = - 5/18 -216/18 = -221/18
Decide on your denominator and go through the same processes for the second problem.
I hope this helps. Thanks for asking.
#1. 10-15/(3)(6)-12
#2. 11-15/(6)(4)-18
this is what i come up with
#1 -4/24-18=-4/6
#2 -5/18-12=-5/6
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