Question 976957

Will you help me to solve this by grouping symbols and PEMDAS give me the full solution thanks. 

1. 2{2[8-(7-2)³÷25]+6}-3
2. 125-3[3+(8+14÷7)²]
3. 12[5(3+2)-8(4-2)]+4
4  3[6+7(3-2+4)²+5]

Thankyou in advance!
<pre>I'll do the first: 1. {{{2(2(8 - (7 - 2)^3/25) + 6) - 3}}}
{{{2(2(8 - 5^3/25) + 6) - 3}}}
{{{2(2(8 - 125/25) + 6) - 3}}}
2[2(8 - 5) + 6] - 3
2[2(3) + 6] - 3
2(6 + 6) - 3
2(12) - 3
24 - 3 = {{{highlight_green(21)}}}