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Sagot :

-2.1 - x = -1.5

-x = .6

x = -0.6

answer: C

We are given the equation:

[tex]{:\implies \quad \sf -2.1-\underline{?}=-1\dfrac12}[/tex]

Let assume the unknown value be x, so that:

[tex]{:\implies \quad \sf -2.1-x=-\dfrac32}[/tex]

[tex]{:\implies \quad \sf x-1.5=-2.1}[/tex]

[tex]{:\implies \quad \sf x=1.5-2.1=\boxed{\bf -0.6}}[/tex]

Hence, Option c) is correct