Stimulus Attributes :
Items should be set in a mathematical context.
Items may use function notation.
Items should be linear equations in the form of ax + b = c,
a(bx + c) = d, ax + b = cx + d, or a(bx + c) = d(ex + f), where a, b, c, d, e,
and f are rational numbers. Equations may be given in forms that are
equivalent to these.
Coefficients may be a rational number or a variable that represents
any real number.
Items should not require more than four procedural steps to reach a