Hey there!
3w = 84
DIVIDE 3 to BOTH SIDES
3w/3 = 84/3
CANCEL out: 3/3 because it give you 1
KEEP: 84/3 because it give you the w-value
NEW EQUATION: w = 84/3
SIMPLIFY IT!
w = 28
Therefore, your answer is: w = 28
Good luck on your assignment & enjoy your day!
~Amphitrite1040:)