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

Walnuts 30 = 5.00 * 6

Cashews $\displaystyle{12}{x}\usepackage{cmbright}\Huge\$ = 12.00 * $\displaystyle{x}\usepackage{cmbright}\Huge\$

Total Mix $\displaystyle{8}{\left({x}+{6}\right)}\usepackage{cmbright}\Huge\$ = 8.00 * $\displaystyle{x}+{6}\usepackage{cmbright}\Huge\$

	Total cost ($)	=	Price ($/pound)	*	Amount (pounds)
Walnuts	30	=	5.00	*	6
Cashews	$\displaystyle{12}{x}\usepackage{cmbright}\Huge\$	=	12.00	*	$\displaystyle{x}\usepackage{cmbright}\Huge\$
Total Mix	$\displaystyle{8}{\left({x}+{6}\right)}\usepackage{cmbright}\Huge\$	=	8.00	*	$\displaystyle{x}+{6}\usepackage{cmbright}\Huge\$