6a+3a=18
Add 6a and 3a.
9a=18
Divide each term in 9a=18 by 9.
9a9=189
Cancel the common factor of 9.
Cancel the common factor.
9a9=189
Divide a by 1.
a=189
a=189
Divide 18 by 9.
a=2
a=2
Solve for a 6a+3a=18
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