Question

Tìm các số nguyên x, biết: a:-5+2x=-45; b:-x/4=28/16

Answer 1

a)

\(-5+2x=-45\Leftrightarrow2x=-45+5\Leftrightarrow2x=-40\Leftrightarrow x=-20\)

Answer 2

\(-\dfrac{x}{4}=\dfrac{28}{16}\Leftrightarrow-\dfrac{4x}{16}=\dfrac{28}{16}\Leftrightarrow-4x=28\Rightarrow x=-\dfrac{28}{4}=-7\)

Answer 3

-5 + 2x = -45

       2x  = -45 - (-5)

       2x  = -40

        x   = -40 : 2

        x    = -20

Vậy x = -2