Which equation is an identity?

3(x - 1) = x + 2(x + 1) + 1

x-4x + 1) = -3(x + 1) + 1

2x+3 = 2(4x + 2) + 2

(6x – 3) = 3(x + 1) - x-2

3,6 and 7.

step-by-step explanation:

a) unit place of 37 is 7

so the unit place of cube of 37 will be

7³= 343=3

the answer is 3.

b) unit place of 56 is 6, so the unit place of cube of 56 will be

6³= 216=6

the answer is 6.

c) unit place of 133 is 3, so the unit place of cube of 133 will be

3³= 27= 7.

the answer is 7.