This a basic algebra practice involving subtraction of a product of a constant with linear expression, from a sum of two linear expressions, or subtraction of the sum of two linear expressions from the product of a constant and a linear expression.
The original practice involving subtraction of the product of a constant with a linear expression from a quadratic expression has been transferred to
https://www.geogebra.org/material/show/id/q9fvjqqt
This version is mobile friendly, using calculator style buttons to input into inputbox area.
