The ornamental design for a washingmachine, as shown and described.
FIG. 1 is a front perspective view of a washing machine, showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left-side view thereof;
FIG. 5 is a right-side view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The broken lines illustrating portions of the washing machine form no part of the claimed design. The dot dash lines in the figures represent an unclaimed boundary line and form no part of the claimed design.