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3x + 12 = 30

x = 6

Step-by-step explanation:

write it out,

3x + 12 = 30

      -12   -12

3x        = 18

3x/3      18/3

x = 6

6

Step-by-step explanation:

instead of adding, we can use subtraction as our inverse operation

30 - 12 = 18.

to check,  we can add 12 and 18 and see what we get.

12+ 18 = 30

Therefor, we are left with 18, but the equation is 3x + 12 = 30. not x + 12 = 30...

so, do 18 divided by 3 and you get 6!

6 = x

answer: i believe its b. if you sound out the sentences that sounds wrong.

(23*2)-12=x     x=34

step-by-step explanation: