How many pounds of walnuts that cost $6 per pound must be mixed with 5 pounds of cashews that cost $9 per pound to make a mixture of nuts that costs $7 per pound?

Use the following table to help:

Total cost ($) = Price ($/pound) * Amount (pounds)

Walnuts $\displaystyle{6}{x}\usepackage{cmbright}\Huge\$ = 6.00 * $\displaystyle{x}\usepackage{cmbright}\Huge\$

Cashews 45.00 = 9.00 * 5

Total Mix $\displaystyle{7}{\left({x}+{5}\right)}\usepackage{cmbright}\Huge\$ = 7.00 * $\displaystyle{x}+{5}\usepackage{cmbright}\Huge\$

	Total cost ($)	=	Price ($/pound)	*	Amount (pounds)
Walnuts	$\displaystyle{6}{x}\usepackage{cmbright}\Huge\$	=	6.00	*	$\displaystyle{x}\usepackage{cmbright}\Huge\$
Cashews	45.00	=	9.00	*	5
Total Mix	$\displaystyle{7}{\left({x}+{5}\right)}\usepackage{cmbright}\Huge\$	=	7.00	*	$\displaystyle{x}+{5}\usepackage{cmbright}\Huge\$