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8 - 4d = 12-4d = 4d = -1
12 + 5 equals...
-12 (?)
12/3 = 4
25
Add 12 to each side: a = 36 + 12 = 48
If n + 7 = 12, then n = 12 - 7
3x=12 3x/3=12/3 x=4
x=12
-0.5
-12=m+4 -16=m
m-12=25. m=37