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Equation:
9(a+2)=189
Solve the equation:
9a+18=189
9a=189-18
9a=171
a=171/9
a=19
Check the solution:
Let a=19
9(a+2)=189
9(19+2)=189
171+18=189
189=189
Therefore, the equation is 9(a+2)=189 and a is 19.