17g+6=20g+3 solve for the variable g.

1g is the answer

minus 6 and 3=3
minus 17 and 20
3g=g
1=g

You need to isolate the variable g onto one side. Since we're going backwards, we need to do the opposite of the order of operations. Step one is to subtract 20g from both sides. 17g-20g is -3g. -3g+6=3. Now, subtract 6. 3-6=-3. 
-3g=-3. Finally, divide both sides by -3. -3/-3 is 1, so G is 1. 

Subtract 2 from all the first numbers and add 3 to all the second ones for new coordinates