How do I rewrite the linear expression by factoring out the coefficient of the variable

Ex. - x - 10

so your example can work as - 1 (x+10), factoring out coefficients usually pertains to finding the highest number (and variable) that an equation can be multiplied by, note that a variable can work the same 2x^2 (x+2) is the same as 2x^3+4x^2