Answer
a) $12 - x = -45$
b) $12x = -45$
c) $x - 10 = 2x$
Work Step by Step
a) Since the difference of 12 and the number $x$ is -45, we have, $12 - x = -45$.
b) Since the product of 12 and the number $x$ is -45, we have $12x = -45$.
c) Since the number $x$ less 10 is twice the number itself, we have, $x - 10 = 2x$.