[tex]\displaystyle 0,9x-3,6=-0,4x+4,2\\0,9x+0,4x=4,2+3,6\\1,3x=7,8\\x=6[/tex]
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[tex]\displaystyle 0,9x-3,6=-0,4x+4,2\\0,9x+0,4x=4,2+3,6\\1,3x=7,8\\x=6[/tex]