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420/l=15
We move all terms to the left:
420/l-(15)=0
Domain of the equation: l!=0We multiply all the terms by the denominator
l∈R
-15*l+420=0
We add all the numbers together, and all the variables
-15l+420=0
We move all terms containing l to the left, all other terms to the right
-15l=-420
l=-420/-15
l=+28
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