a=5-2b
3a-b=8
3(5-2b) - b =8
15-6b-b=8
-7b=-7
b=1
a=3
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a=5-2b
3a-b=8
3(5-2b) - b =8
a=5-2b
15-6b-b=8
a=5-2b
-7b=-7
a=5-2b
b=1
a=3