Mathematika
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Addition Subtraction Multiplication Division https://www.google.ch/search?q=algebra&client=browser-ubuntu&hs=JAd&channel=fe&hl=de&source=lnms&tbm=isch&sa=X&ved=0CAcQ_AUoAWoVChMIjZzgo9CHyAIVwlUaCh2XCQPs&biw=1535&bih=805#tbm=isch&tbs=rimg%3ACeuwahXoXVlZIji9ugu3nAH0b56eskj2Cvvnzlc7zkn0QDUobIu4VJQ1nFC_1IveyNKPVKeCyc3f29aMQy-acpIXf4SoSCb26C7ecAfRvERDFE5Ppj_1kjKhIJnp6ySPYK--cR90g_1a2oSbEYqEgnOVzvOSfRANRHxEf9N3ZOdfCoSCShsi7hUlDWcEYDKJ2LT-fJAKhIJUL8i97I0o9URhEWfkV405DMqEgkp4LJzd_1b1oxHNvGyzvzZGwCoSCRDL5pykhd_1hEdtW5NgA7cKI&q=algebra&hl=de&imgrc=_