Answer
a=624

Steps Explained:
Solve for a
6a + 4a + 120 = 6360
Group the a terms on the left:
(6 + 4)a = 10a
Form modified equation
10a + 120 = + 6360
Divide each side by 6
Group constants
Group our constants 120 and 6360.
subtract 120 from both sides
10a + 120 - 120 = 6360 - 120
Cancel 120 on the left side:
10a = 6240
Divide each side of the equation by 10
a = 624
Final Answer
a=624
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