solve the equation

15-4x=2(3x+1)
15-4x=6x+1
-4x+6x+1-15
2x-14
x=-14/2=-7

2 answers

15-4x = 2(3x+1)
15-4x = 6x + 2
Combine all the 'x' terms on one side and the constant terms on the other side.
15 - 2 = 6x + 4x
13 = 10x
So, x=?
No, you made a handfull of errors.

Second line, on the right should be +2
Third line. What happened to equal signs? THis is awfully sloppy work.

15-4x=6x+2
subtract 15 from both sides.
Subtract 6x from both sides.