3x - 5y = -7

9x + 7y = 89

multiply number one with 3. Then we have:

9x-15y=-21

9x+7y=89

Draw number one from number two.

22y=110 is the result.

y=110/22=5.

Then we put y=5 into number one and get:

3x-15*5=-7

3x=75-7=68

x=68/3=22.667

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