Combining Like Terms and Two Step Equations

8m + 3 - 12m - 7

• 20m - 4

• 4m - 4

• -4m + 4

• -4m - 4

n - 10 + 9n - 3

• 8n - 7

• 10n - 7

• 10n - 13

• 8n - 7

-2x + 11 + 6x - 5

• 4x + 6

• -4x - 6

• -8x - 16

• 4x - 6

n + 4 - 9 - 5n

• -4n - 13

• -6n - 5

• 4n - 5

• -4n - 5

-4m + 7(3m - 5) + 2

What do you do first?

• combine -4m and 3m

• underline the variable terms

• multiply 7 and 3m

• circle the constants

9a + 10(6a - 1) + 4

What does the next step look like?

• 9a + 16z - 9 + 4

• 9a + 60a - 1 + 4

• 9a + 60a - 10 + 40

• 9a + 60a - 10 + 4

-9(6m - 3) + 6(1 + 4m)

-54m - 27 + 6 + 24m

-30m - 21

Where was the mistake? Which term isn't correct?

• the -54m

• the - 27

• the - 30m

• the 24m

9x - 7 = -7

x = ?

(number only)

(a)  

r = ?

Mathematical Equivalence

OFF

8n + 7 = 31​

n = ?

(number only)

(a)