Solve for A
A=6375
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A-3000-12000+8625=0
Multiply 1500 and 8 to get 12000.
A-15000+8625=0
Subtract 12000 from -3000 to get -15000.
A-6375=0
Add -15000 and 8625 to get -6375.
A=6375
Add 6375 to both sides. Anything plus zero gives itself.
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