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3a=19-4
3a=15
a=15 per 3
a=5
b.-2+4b=10
4b=10+2
4b=12
b =12 per 4
b=3
c. 2m=-16
m=-16 per 2
m=-8
d. -5n=-45
n=-45 per -5
n=9
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