It is 4h+8 although you could re-write it as 4*(h+2)
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4h + 6 = 22 So 4h = 16 and then h = 4
-98-4h+8k-40+k-9h = (-98-40)+(-4h-9h)+(8k+k) = -138-13h+9k
It is an equation in one variable.
You can chose any letter as your variable. I'll use f. 8+f=24 Subtract 8 from both sides. f=16
8 h 30 min =7h 100 m 7h 100min-4h 55 min=3h 45 min