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If I've read your question correctly, you need to subtract: a2 +2a -7

a2 -4a2 +5a2 -6 = 2a2 -6

Note, if x - y = z, then y = x - z; so:

2a2 -6 - (a2 -2a +1) = 2a2 -6 - a2 +2a -1

= a2 +2a -7

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13y ago

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