Answer:
x=29
Explanation:
Ok, so you want to get x alone by itself on one side of the equal sign in order to solve for x. but is it alone? no. What is being done to it? 17 is being subtracted from it.
x-17=12
So you need to undo that by doing the opposite. The opposite of subtracting 17 is adding 17, so you need to add 17 to both sides of the equal sign.
x-17+17=12+17 Whenever you're working with equations (has an = sign) whatever you do to one side you HAVE to do to the other. that's why you have to add 17 to both sides. Then, simplify. The -17+17 cancel out
x=12+17
x=29