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=-3ab-6a²-2ab-b²-3ab²-6a²b²=
=-9ab²-5ab-6a²-b²
b) 6a(5a²-8b)-10a(6b+7a²)-3ab=
= 6a ×5a²-8b-10a × 6b -7a²-3ab=
=30a³-8b-60ab-7a²-3ab=
= 23a²-63ab-7a²