Answer :

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${teks-lihat-gambar} Аноним

2a plus 3b =12

5a minus 1b =13  multiply this by -3 to match 3b in equation 1

2a plus 3b =12

-15 plus 3b =-36

plus 15           plus 15

3b= -21

divide by 3  on both sides

b= -7


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