Write the statement as an equation $:$ $7$ substracted from thrice a number is $18 .$

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Solution

Writing the equation
A statement of equality which involves one or more variables is called an equation.
Let the number be $x$
Thrice the number $\Rightarrow 3 x$
$7$ substracted from thrice the number $\Rightarrow 3 x - 7$
$7$ substracted from thrice the number is $18$ $\Rightarrow 3 x - 7 = 18$
The LHS of the equation is $3 x - 7$ and RHS of the equation is $18$
Hence the required equation is $3 x - 7 = 18$

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