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1a + 18 = 7a

1a+18=7a

18=7a-1a

18=6a

6a=18

a=18/6

a=3

Subtract the 1a from the 7a.

1a + 18 = 7a

-1a - 1a

you're then left with 18=6a. divide the 6 with the 18 to cancel out.

18=6a

/6a / 6a

18 divided by 6 is 3. So your answer is a=3