ответ:

[tex]\displaystyle -\frac{7}{4}=-1\frac{3}{4}=-1,75[/tex]

решение:

[tex]\displaystyle 4x+7=0\\4x+7-7=0-7\\4x=0-7\\4x=-7\\4x:4=-7:4\\x=-7:4\\\\x=-\frac{7}{4}=-1\frac{3}{4}=-1,75[/tex]