Hello people. I need all none-negative integers $(a_1,a_2,b_1,b_2)$ where $$a_1+a_2=b_1+b_2 \; \\ \\ \\ a_1a_2 =b_1b_2 \; $$
$a_i \ne b_j, \; \; i,j=1,2$
$a_i \ne b_j, \; \; i,j=1,2$
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