SOLUTION: What would the next equation be to keep the pattern going? 1+2=3 4+5+6=7+8

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Question 988932: What would the next equation be to keep the pattern going?
1+2=3
4+5+6=7+8
Answer by macston(5194) About Me  (Show Source):
You can put this solution on YOUR website!
.
x+(x+1)+(x+2)+(x+3)=(x+4)+(x+5)+(x+6)
4x+6=3x+15
x=9
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ANSWER: 9+10+11+12=13+14+15
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CHECK:
9+10+11+12=13+14+15
42=42