How do you solve #11x-21=8x+15#?

Question

2245 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2018-03-25T19:36:46

#x = 12#

So you first want to get everything with an #x# to one side. So we add #21# to both sides:

#11x - 21 = 8x + 15 " " | +21#

#11x = 8x + 36#

And then subtract #8x# from both sides:

#11x = 8x + 36" " | -8x#

#3x = 36#

For the final step, we divide by #3# on both sides:

#3x = 36" " | div 3#

#x = 12#