To solve for x, we need to isolate x by dividing both sides of the equation by 3/7.
(3/7)x = 21
x = 21 / (3/7)
To divide by a fraction, we can multiply by the reciprocal of the fraction.
x = 21 * (7/3)
x = 147 / 3
x = 49
Therefore, x = 49.
Solve for x: 3/7 x = 21
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