A tin had x litre oil.Another tin had (3x2+6x-5) litre of oil. The shopkeeper added (x+7) litre more to the second tin.Later he sold (x2+6) litres of oil from the second tin.How much oil was left in the second tin?

A tin had x litre oil.Another tin had $(3 x^{2} + 6 x - 5)$ litre of oil. The shopkeeper added (x+7) litre more to the second tin.Later he sold $(x^{2} + 6)$ litres of oil from the second tin.How much oil was left in the second tin?

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