original problem:
(m-24+9)-(3m-7n-12)
distribute the negative sign:
(m-24+9)+(-3m+7n+12)
collect like terms:
-2m+7n-3
that is as far as you can simplify this problem without knowing the values of m and n
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15 + n = 24 (subtract 15 from both sides) n = 9
24 = 3x + 9 -9 -9 Subtract 9 from each side15 = 3x/3 /3 Divide 3 from each side5 = x You are left with five equals X
7P + 9 = 16 + 6P subtract 6P from BOTH sides P + 9 = 16 subtract 9 from both sides P = 7
24+-9=15
It is: (15-7)*(12-9) = 24