projection conversion from mercator to google maps format

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Is this

spTransform(Finland3, CRS("+proj=longlat +ellps=WGS84 +no_defs+ellps=WGS84 +towgs84=0,0,0 "))the right way to project a shapefile with this projection

coord. ref. : +proj=merc +lon_0=0 +lat_ts=0 +x_0=0 +y_0=0 +datum=WGS84 +units=m +no_defs +ellps=WGS84 +towgs84=0,0,0 to plot it in ggmap on top of a Google map raster?

therefore looking like

+proj=longlat +ellps=WGS84 +towgs84=0,0,0

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