This one is pretty easy.
x+ 4 = 7
Subtract 4 from both sides so you can isolate the x (Get the x alone)
x = 7 -4
x = 3
That's your answer. 3.
It equals zero negative plus positive equals zero
The answer is 9 because 5*(-3)+8+9-(-7)=9
Answer:
C

Co efficient means the number or value beside preventing the variable from standing alone