So the equation looks like this : 15*3x=78
subtract 15 from both sides: -15 -15
then divide by 3 from both sides
to isolate the variable: 3x=63
3/3x=63/3
x=21 (your mystery number is 21)
Answer:
(n+5) / 4 -7 =___________
Answer: f(x)=cos(x)
Step-by-step explanation:
