Solve: $x-1.39=8.67$x−1.39=8.67

Solve $-n=29$−n=29.

Solve $-u=-28$−u=−28.

The following equation contains a geometric figure that represents a nonzero real number. Solve the equation for $x$x.

►$=$=$-x$−x

Solve first-degree equations involving one variable, including equations with fractional coefficients