Question

If 5x + 7 = 42, the value of x is-​

Answer 1

Answer:

x=7

Step-by-step explanation:

hope helpfull to u.

Answer 2

Solve the equation :-

$\sf Q) \: 5x + 7 = 42$

Transposing 7 from LHS to RHS, changing it's sign,

$\sf \Rightarrow5x = 42 - 7$

On subtracting,

$\sf \Rightarrow5x = 35$

Transposing 5 from LHS to RHS, changing it's sign,

$\sf \Rightarrow x = \dfrac{35}{5}$

Dividing 35 by 5,

$\sf \Rightarrow x = 7.$

The value of x is 7.

______________________________________

Verification :-

To check our answer, we just have to replace x with 7 (The value of x) and see whether LHS = RHS.

Doing so, we get :-

LHS

$\sf \Rightarrow5 \times 7 + 7$

Using the BODMAS rule and multiplying first,

$\sf \Rightarrow35 + 7$

On adding,

$\sf \Rightarrow42.$

RHS

$\sf \Rightarrow42.$

Since LHS = RHS,

Hence verified!

______________________________________