Simplifying expressions by collecting like terms

Simplify: 7a - 5a + 6b - 12b
6b+2a
2a+-6b
2a-6b
Simplify: 20x - 10y - 6z - 10x - 6z
10x + 10y
10x - 10y - 12z
10y + 10x + 12z
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