The ornamental design for a washingmachine, as shown and described.
1. Washing machine
1.1 : Perspective
1.2 : Front
1.3 : Back
1.4 : Left
1.5 : Top
1.6 : Bottom
1.7 : Reference view 1
1.8 : Reference view 2
The broken lines depict portions of the washing machine that form no part of the claimed designs; reproduction 1.1 is a front perspective view of the washing machine; reproduction 1.2 is a front view thereof; reproduction 1.3 is a back view thereof; reproduction 1.4 is a left view thereof where the right view is a mirror image; reproduction 1.5 is a top view thereof; reproduction 1.6 is a bottom view thereof; reproduction 1.7 is a reference enlarged view thereof showing an example of the usage of the design in which the letters are printed on the control panel part when the display part of the top door is not operated; reproduction 1.8 is a reference enlarged view thereof showing an example of the usage of the design in which the display part of the top door is operated.