Answer:
h = r - 7x
r = 7x + h
Step-by-step explanation:
[tex]x=\dfrac{r-h}{7}\qquad\text{multiply both sides by 7}\\\\7x=r-h\\\\\text{for}\ h:\\\\r-h=7x\qquad\text{subtract}\ r\ \text{from both sides}\\\\-h=-r+7x\qquad\text{change the signs}\\\\\boxed{h=r-7x}\\\\\text{for}\ r:\\\\r-h=7x\qquad\text{add}\ h\ \text{to both sides}\\\\\boxed{r=7x+h}[/tex]
