Answer:
x = - g - c + y or g+c-y=x
Step-by-step explanation:
[tex]g=x-c+y\qquad\text{add}\ c\ \text{to both sides}\\\\g+c=x-c+c+y\\\\g+c=x+y\qquad\text{subtract}\ y\ \text{from both sides}\\\\g+c-y=x+y-y\\\\g+c-y=x\to x=g+c-y[/tex]