Solve `t - 7 < -15.`

`t - 7 + 7 < -15 + 7`

`t < -8`

See image for graph.

Solve `b + 12 < 18.`

`b + 12 - 12 < 18 - 12`

`b < 6`

See image for graph.

**Solutions are `t < -8` and `b < 6.`**

**Images:**

Solve `t - 7 < -15.`

`t - 7 + 7 < -15 + 7`

`t < -8`

See image for graph.

Solve `b + 12 < 18.`

`b + 12 - 12 < 18 - 12`

`b < 6`

See image for graph.

**Solutions are `t < -8` and `b < 6.`**

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