Answer :

5. 56+(3x+7)=90
   -56              -56
~~~~~~~~~~~~~
      3x+7=34   
           -7  -7
~~~~~~~~~~~~~
      3x=27      (divide by 3 to isolate x)
   3x/3=27/3
         x=9       (plug in 9 for x, 3(9)+7= 34)

7. 47+(2x+13)=90
   -47               -47
~~~~~~~~~~~~~~
      2x+13= 43
          -13   -13
~~~~~~~~~~~~~~
           2x=30   (divide by 2)
    2x/2=30/2
        x=15      (plug in 15 for x, 2(15)+13= 43
 
    

Answer:

just going to explain the first one

Step-by-step explanation:

so, you can tell by the square in the corner that its a 90 degree angle.

take 56 and subtract from 90 and you should get 34

after that its straight forward from there

just do 3+7= 10

subtract 10 that from 34

and what you have left should be x.

x=24

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