Write Two-Step Equations

Twice a number increased by 5 is 21.

• 5x +21 = 5

• 2x + 5 = 21

• 5 - 2x = 21

• 21x + 5 = 2

5 times a number decreased by 7 is 63.

• 63 + 7x = 5

• 7x - 5 = 63

• 5x - 7 = 63

• 7x - 5 = 63

When 8 is subtracted from 6 times a number, the result is 4.

• -8 + 6x = 4

• 6x + 8 = 4

• 4 = 8 + 6x

• 4 = 8 - 6x

The difference between 8 times a number and 5 times the same number is 36.

• 5x - 8x =36

• 8x - 5x = 36

• 8x - 5 = 36

• 5x - 8 = 36

If we double a number and add 3, we get 15.

• 2x + 3 = 15

• 15x + 2 = 3

• 3x + 2 = 15

• 3x + 15 = 2

2 times 5 more than x is 16

• x + 10 = 16

• 2x + 16 = 5

• 2(x + 5) = 16

• 2x + 5 = 16

7 less than half a number is 25

• 25/2 + x = 7

• 7x - 1/2 = 25

• 2x - 7 = 25

• .5x - 7 = 25