78=2(l-7)+2l

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Solution for 78=2(l-7)+2l equation: 



78=2(l-7)+2l

We move all terms to the left:

78-(2(l-7)+2l)=0



We calculate terms in parentheses: -(2(l-7)+2l), so:

2(l-7)+2l

We add all the numbers together, and all the variables

2l+2(l-7)

We multiply parentheses

2l+2l-14

We add all the numbers together, and all the variables

4l-14

Back to the equation:

-(4l-14)



We get rid of parentheses

-4l+14+78=0

We add all the numbers together, and all the variables

-4l+92=0

We move all terms containing l to the left, all other terms to the right

-4l=-92

l=-92/-4

l=+23

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