State which of the following are equations (with a variable). Give reason for your answer. Identify the variable from the equations with a variable.
a. 17=x+7
b. (t−7)>5
c. 24=2
d. (7×3)−19=8
e. 5×4−8=2x
f. x−2=0
g. 2m<30
h. 2n+1=11
i. 7=(11×5)−(12×4)
j. 7=(11×2)+p
k. 20=5y
l. 23q<5
m. z+12>24
n. 20−(10−5)=3×5
o. 7−x=5