Is 9 + 3 + 6x the simplify expression of 9 - (3 - 6x)?
Explain why?
a) he should multiply before subtracting
b) he should subtract 9 - 1 first
c) he cannot simplify 3 - 6x
d) he correctly simplified inside the parentheses first
e) he did not multiply 3 by -1 correctly
f) he distributed correctly
