2. Subtract

1. Subtract \(4a–7ab+3b+12\) from \(12a–9ab+5b-3\)
 
2. Subract \(3xy + 5yz – 7zx\) from \(5xy – 2yz – 2zx + 10xyz\)
Answer variants:
\(8a-2ab+2b-15\)
\(2xy-7yz+5zx+10xyz\)
\(8a-2ab+2b+15\)
\(2xy-7yz+5zx+10xyz\)
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