Posted by **Anonymous** on Monday, February 4, 2008 at 10:47pm.

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

- geometry -
**aj**, Monday, February 4, 2008 at 11:48pm
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

- geometry -
**drwls**, Tuesday, February 5, 2008 at 1:45am
The previous answer is correct, but this subject is NOT geometry.

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