Simplify: $13m-4m\times2$13m−4m×2

Simplify: $2p-6p\times3$2p−6p×3

Simplify $2\left(4x+3x\right)$2(4x+3x)

Simplify the following expression:

$15x+\left(13x-8x\right)$15x+(13x−8x)

Generalise the properties of operations with fractional numbers and integers.