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=500+7E
We move all terms to the left:
-(500+7E)=0
We add all the numbers together, and all the variables
-(7E+500)=0
We get rid of parentheses
-7E-500=0
We move all terms containing E to the left, all other terms to the right
-7E=500
E=500/-7
E=-71+3/7
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