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R is generated by x and y such that |x| = 7 and |y|=3 with x...

R is generated by x and y such that |x| = 7 and |y|=3 with x and y related by yx=x2y.
1) state the order of R and find the elements of R
2) what is the order of each element?
3)find 3 proper nontrivial subgroups of R

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