Isn't there a way to set this up? ? or idek, just i need to know how to solve

Tomas is making trail mix using granola and walnuts. he can spend a total of $12 on the ingredients. he buys 3 pounds of granola that costs $2.00 per pound. the walnuts cost $6 per pound. he uses the equation to represent the total cost, where x represents the number of pounds of granola and y represents the number of pounds of walnuts. he solves the equation for y, the number of pounds of walnuts he can buy. answer- b tomas added 6 to both sides of the equation instead of subtracting 6. just took the test

Given abcd ac=38 and ae=3x+4 find the value of x

Negative 5 1/12 + negative 4 1/4 + 6 3/4