geometry

3a+30-12=75 how do you do this

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  1. 3a+30-12=75
    you combine 30-12 and get:
    3a+18=75
    then you subtract 18 from both sides:

    3a-18=75-18

    and get:

    3a=57

    then divide both sides by 3
    3a/3=57/3
    a=19

    So 'a' equals 19

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  2. The previous answer is correct, but this subject is NOT geometry.

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