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

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

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

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