Question

If 3x + 6 = 21, what does x + 2x plus 2 equal?

Answer 1

x+2x+2=17

Explanation:

I'm assuming that's what you're asking, so here is the answer explanation.

3x+6=21

3x=15

Hence, x=5

Apply x=5 to x+2x=2

5+10+2

=17