If $3 x + 6 = 21$ , then x is

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Solution

The correct option is C 5
Given: An algebraic equation is $3 x + 6 = 21$

$Let's solve for x : - ---------------- -$
$3 x + 6 = 21$
Subtract 6 from both the sides
$3 x + 6 - 6 = 21 - 6$
$3 x = 15 (∵ 6 - 6 = 0; 21 - 6 = 15)$
$x = \frac{15}{3} (∵ bring 3 as a reciprocal to the RHS$
$x = 5$

$∴ The value of x = 7$

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