In algebra it is fully possible for x to equal to zero. After you have 2x, just divide both sides by two, so it would be 2 divided by 0 and than you would have x=0 and that would be your final answer.
2x + 1 = 4x +1
-2x +1 = 1
-2x = 0
divide by -2
x=0
2) C
3) B
4) C
6) I'm pretty sure its D but it could be C
40% of 85 is 34 so 85-34=51
51 is your answer
2r+7+2n+n2
Because I combined the ones with like terms.
