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algebra · worked example

Solve 7x = 21 — x = 3

Method: tách biến tuyến tính. Verified step-by-step solution with our free AI math solver.

Problem

$7x = 21$

Step-by-step solution

Chia cả hai vế cho $7$ : $x = \frac{21}{7}$ .
Rút gọn: $x = 3$ .

Answer

$x = 3$

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