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So here are some maths from easy to hard...
1st: 5+3*7
2nd: 32x+5-10x=7x-15
3rd: (x+y)(x+y)
4th: (x+y)(x-y)
So that's it. Try to find the answers.
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Any other anime fans in this forum? Comment your favourite anime. Mine is One Piece :D