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840=l*6*7
We move all terms to the left:
840-(l*6*7)=0
We add all the numbers together, and all the variables
-(+l*6*7)+840=0
We get rid of parentheses
-l*6*7+840=0
Wy multiply elements
-42l*7+840=0
Wy multiply elements
-294l+840=0
We move all terms containing l to the left, all other terms to the right
-294l=-840
l=-840/-294
l=2+6/7
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