Question

2x + 5x = 21
what is x

Answer 1

Answer:

x=3

Step-by-step explanation:

Given Question,

2x+5x=21

7x=21

x=21/7 [Transposing 7 to Right hand side]

x=3

Thus the vale of x is equal to 3

Answer 2

As per the data in given equation

In above question it is given that

We have find the value of given expression

Given the data in question 2x + 5x = 21

We have find the value of given expression

To solve this expression, we have to use the transposition method:  

As we have,

$2x+5x=21\\7x=21$

divide both side by $7$

$\frac{7x}{7} =\frac{21}{7} \\x=3$

Hence, value of "x" in above equation will be $3$.