If 10x + 2 = 7, what is the value of 2x?

Solution:

Given equation is 10x + 2 = 7

Let us solve for x and then evaluate 2x.

⇒ 10x = 7 - 2

⇒ 10x = 5

⇒ x = 5/10

⇒ x = 1/2

Therefore,

⇒ 2x = 2(1/2) = 1

Another similar example : Given 15x + 6 = 12, find the value of 5x

⇒ 15x + 6 = 12

⇒ 15x = 12 - 6

⇒ 15x = 6

⇒ x = 6/15 = 2/5

⇒ 5x = 5(2/5) = 2

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If 10x + 2 = 7, what is the value of 2x?

Summary:

If 10x + 2 = 7, the value of 2x is 1