l+l+(l-4+l-4)=72

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Solution for l+l+(l-4+l-4)=72 equation:


l+l+(l-4+l-4)=72

We simplify the equation to the form, which is simple to understand 
l+l+(l-4+l-4)=72

Remove unnecessary parentheses
+l+l-8+2l=+72

We move all terms containing l to the left and all other terms to the right. 
+1l+1l+2l=+72+8

We simplify left and right side of the equation. 
+4l=+80

We divide both sides of the equation by 4 to get l. 
l=20

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