Question

$({3}^{3}) ^{7 } = {3}^{7x}$
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Answer 1

Step-by-step explanation:

${( {3}^{3} })^{7} = {3}^{7x} \\ so \: {3}^{21 } = {3}^{7x } \\ so \: 21 = 7x \\ x = \frac{21}{7 } \\ x = 3$