3 times 2x = 6x
3 times 2 = 6
now u have
6x+6+(1)x+5=-10
if the letter is alone there is a 1 there.
6x+1x=7x
6+5= 11
7x+11 = -10
flip 11 to -11
7x = -10-11= -21
7x=-21
(forgot this part)
7 divide by 21 is 3
x= -3
Hope this helps
