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in step 3 in which Ernesto had to mutiply 3 with 7 and he didn't do it, so it should be like this;

x-y = 7

3x-2y = 8

Step 1: x= y+7

Step 2: 3(y+7)-2y = 8

Step 3: 3y+21-2y =8

Step 4: y = 8-21

Step 5: y = -13 (correct answer)

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