I'll assume the missing signs are pluses.
7a^2 - 12a + 14
13 + 52 = 65
36
Solve for y: f(-5)=13+2x
4r + 13 = 57subtract 13 from both sides:4r + 13 - 13 = 57 -134r = 44divide both sides by 4 to solve for r:4r/4 = 44/4r = 11
x - 13 = 5 x = 18
x=13
To solve for x, we'd have to know what this expression equals.
-11
13/3 = 4 1/3 (To solve it you just divide 13/3, the answer is 4 but there is a remainder, so to solve for that remainder you just put it on top of the 3)
542 X 13 = 7046
5
x>5