SOLUTION: One Number is 21 More than another. Their sum is -423, Find the numbers?

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Question 535987: One Number is 21 More than another. Their sum is -423, Find the numbers?
Answer by Math_prodigy(24) About Me  (Show Source):
You can put this solution on YOUR website!
y=x+21
x+y=-423
x+(x+21)=-423
2x+21=-423
2x=-444
x=-222
y=-222+21=-201