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algebra

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3(a+2)=4a I multiply 3*a+3*2=4a
so 3a+6=4a I added 3a to 4a/ =7a
and answer was 1(answer is 6) i just don't understand how and why we subtract 3a from 4a instead of adding. please help me

  • algebra -

    You have got:
    3a+6=4a
    but we know that
    3a =3a
    So subtract one equation from the second,
    3a+6-3a = 4a-3a
    which gives
    6 = a

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