HI there!
So, first we need to be left with only one term on each side, but the term with the variable needs to remain.
You will subtract 3 from both sides.
6c + 3 = 45
3 minus three is 0, so you are left with 6c on the left side. 45 minus 3 is 42, so you're left with:
6c = 42
Next, we will divide both sides by the coefficient, 6c.
6c divided by 6 is c, and 42 divided by 6 is 7.
Your answer is
c = 7
Hope this helps ya out fam!
~theLoCoCoCo