Debbie solved the linear equation 3(x+4)-2+16 as follow (line 1 ) 3(x+4)-2=16
(line 2) 3(x+4)=18
(line 3 ) 3x+4=18
(line 4) 3x=14
(line 5) x=4 2/3

she made an error between lines

a 1 and 5
b 2 and 3
c 3 and 4
d 4 and 5

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