Respuesta :
1. Distribute the negative
(-w+0.4) - (-w-0.4)
-w+0.4+w+0.4
2. Combine like terms
-w+w+0.4+0.4
=0.8
(-w+0.4) - (-w-0.4)
-w+0.4+w+0.4
2. Combine like terms
-w+w+0.4+0.4
=0.8