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algebra · worked example

Solve 7x = 21 — x = 3

Method: 線性移項求解. Verified step-by-step solution with our free AI math solver.

Problem

$7x = 21$

Step-by-step solution

兩邊同除以 $7$ ： $x = \frac{21}{7}$ 。
化簡： $x = 3$ 。

Answer

$x = 3$

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/solve/algebra/2x-plus-3-equals-7