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2a=2
a= 1
2. -3r=6 - 9
-3r= -3
r= 1
3. 2m= 10 - 18
. 2m= -8
m= -4
2a = 5 - 3 = 2
a = 2 ÷ 2 = 1
b) 9 - 3r = 6
-3r = 6 - 9
-3r = -3
r = 1
c) 18 = 10 - 2m
2m = 10 - 18
2m = -8
m = -4