How do you solve #7x = 2x + 15#?

1 Answer
Dan Kemp
Jun 2, 2017

#x = 3#

Explanation:

#7x = 2x + 15#

We can move #2x# to the other side, changing it from positive to negative.

#7x -2x= 15#

#5x= 15#

Now we can work backwards. The last thing that happened to #x# is that it was multiplied by #5# to get to #15#, so in working backwards, we will do the opposite to #15# to get #x#.

#x= 15 ÷ 5#

#color(blue)(x = 3#

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