l+b=16 and l-2b=2 solve them in substitution method
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l+b=16
l-2b=2
l=2+2b
put the value of l in eq 1
2+2b+b=16
3b=14
b=14/3
put the value of b in eq 2
l=2+2(14/3)
l=(6+28)/3
l=34/3
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