Answer:
-1
Step-by-step explanation:
3(19x -y + 2z) is equivalent to the equation above
It will take 12 years to reach from -14 to -168.
Just multiply 14 time 12 and that's how to get the answer. Make sure to change it as negative, of course.
y=25x+5 is the final equation.
180, because you'd do 12 x 15