The formula C=kmt is used to find the number of calories a person burns during exercise, where m is the person’s weight in pound
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Here is the equation: 
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You need to get "x" by itself so minus 3 from each side
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⇒ 
Divide 8 by 2
÷ 
x=4
So each 4 is equivalent to 4
Lets check:
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⇒ 
So that means that Marcus practiced the piano for 4 hours and Donnel practiced for 7
You need to get "x" by itself so minus 3 from each side
Divide 8 by 2
x=4
So each 4 is equivalent to 4
Lets check:
So that means that Marcus practiced the piano for 4 hours and Donnel practiced for 7