# I need help understanding substitution: Where did it get subtracted by ''6-2b'' to equal ''a=2b-3''?

Anonymous
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### Question Description

Athul K
School: Carnegie Mellon University

hello

first the equation was           6 + a - 2b = 3
subtract (6-2b) from both sides.so,    6+ a - 2b - (6-2b)= 3 - (6-2b)
6 + a - 2b - 6 +2b = 3 -6 +2b
6 - 6 + a -2b +2b = 3 - 6 +2b
0    + a +   0      =   -3  + 2b
a    =  -3 +  2b
this is how you get ,   a = 2b -3

if you have any new questions or doubts,please assign me as your tutor
thank you

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Anonymous
awesome work thanks

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