Solve the brackets, starting from the innermost and working outwards:
2(7x+y(-3(5x-2y)))
multiply by -3: 2(7x+y(-15x+6y))
multiply by y: 2(7x - 15xy+6y2)
multiply by 2: 14x - 30xy + 12y2
I suspect, though, that there is something missing before the -3.
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