Solve the equation:
(i) 3x = 51
(ii) 3x – 8 = 7 – 2x.

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Solution

(i) 3x = 51 (Given)
$\frac{3 \times x}{3} = \frac{51}{3} (\div 3 on both sides)$
$x = 17$
(ii) 3x + 2x = 7 + 8
5x = 15
x = 3

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