91Ó°ÊÓ

In the following exercise, simplify:$\left(a\right)12-9\left(b\right)12+(-9)$

In the following exercise, simplify:$\left(a\right)8-(-9)\left(b\right)8+9$

In the following exercise, simplify:$\left(a\right)4-(-4)\left(b\right)4+4$

In the following exercise, simplify the expression:$10-(-19)$

In the following exercise, simplify the expression:$11-(-18)$

In the following exercise, simplify the expression:$31-79$

In the following exercise, simplify the expression:$39-91$

In the following exercise, simplify the expression:$-31-11$

In the following exercise, simplify the expression:$-32-18$

In the following exercise, simplify the expression:$-15-(-28)+5$