Question

If ln= 6x-5 lm=x+7 mn= 3x+2- find mn

Answer 1

By using this it works:

$LN + LM = MN$

Then we can drive:

$(6x-5) + (x+7) = 3x-2$

and by adding the like terms... :

$7x+2 = 3x-2\\ 4 x= -4\\x=-1$

Hope this understands you...