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l+2l+14=89
We simplify the equation to the form, which is simple to understand
l+2l+14=89
We move all terms containing l to the left and all other terms to the right.
+1l+2l=+89-14
We simplify left and right side of the equation.
+3l=+75
We divide both sides of the equation by 3 to get l.
l=25
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