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

Walnuts 30 = 6.00 * 5

Cashews $\displaystyle{x}+{9}\usepackage{cmbright}\Huge\$
= 9.00 * $\displaystyle{x}\usepackage{cmbright}\Huge\$

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	30	=	6.00	*	5
Cashews	$\displaystyle{x}+{9}\usepackage{cmbright}\Huge\$	=	9.00	*	$\displaystyle{x}\usepackage{cmbright}\Huge\$
Total Mix	$\displaystyle{7}{\left({x}+{5}\right)}\usepackage{cmbright}\Huge\$	=	7.00	*	$\displaystyle{x}+{5}\usepackage{cmbright}\Huge\$