Answer:
x = 84
Explanation:
21 = 1/4x ....multiply both sides by 4
4 * 21 = (1/4 * 4/1)x
84 = 1x or just 84 = x
28 = 1/3x...multiply both sides by 3
3 * 28 = (1/3 * 3/1)x
Yes
21= 1/4 x
21* 4 = x
28 = 1/3x
28*3 = x
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