An image forming system includes first and second image forming apparatuses including respective image forming sections and fixing sections. When the system forms an image on a sheet using the first image forming section, then forms an image on the sheet using the second image forming apparatus, and forms an image on a same side of a sheet which has a nonuniform sheet thickness and first and second regions respectively having small and large sheet thicknesses, the image in the first region is formed and fixed using the first image forming apparatus and the image in the second region is formed and fixed using the second image forming apparatus, and the respective fixing sections of the first and the second image forming apparatuses pass the nonuniform sheet while applying a second load lower than a first load applied to a sheet having a uniform sheet thickness.
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