Find the value of $x$
$2 x - 9 = 51$ .

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Solution

$2 x - 9 = 51$

$\Rightarrow 2 x = 51 + 9$

$\Rightarrow 2 x = 60$

$\Rightarrow x = \frac{60}{2}$

$∴ x = 30$ .

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Find the smallest value of x for which $5 - 2 x < 5 \frac{1}{2} - \frac{5}{3} x$ , where x is an integer.

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The value of the expression $(2 x)^{2} + 5 x$ for $x = 3$ is 51.

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