math help pls i cant do the math omg omg

Question

Alan's Coffee Shop makes a blend that is a mixture of two types of coffee. Type A coffee costs Alan 5.50 per pound, and type B coffee costs 414 per pound. This month, Alan made 142 pounds of the blend, for a total cost of 697.30. How many pounds of type B coffee did he use?

Answer 1

b represents amount of type B coffee

142 - b represents amounts of type A coffee

4.14b + 5.50(142 - b) = 697.30

Can you solve for b and answer?