Answer:
you can solve all your problems posted by this method ...
Step-by-step explanation:
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If you see that 3x-3 and set it equal to x+7 then you will get this,
3x-3=x+7
Now solve for X. You will get 5.
Then you plug five in and get 12 For both sides and then multiply 12 by 4 and get 48.
You answer is 48.
Hope this helps you.
Step-by-step explanation:commutative property
hope it helps