Ok, here’s what to do.
In 2x + 3, highlight x yellow, 3 pink, and 2x green.
In 4xy - 2x, highlight xy and x yellow, and 4xy and 2x green.
In 12f - 12g, highlight f and g yellow, and highlight 12f and 12g green.
In g + 200, highlight g yellow, and highlight 200 pink.
In 3p^3 + 4q, highlight p and q yellow, and highlight 3p and 4q green.