Question

Tìm số nguyên x biết: x - 43 = (57 - x) - 50

Answer 1

x - 43 = ( 57 - x ) - 50

=> x - 43 = ( 57 - 50 ) - x

=> x - 43 = 7 - x

=> x + x = 43 + 7

=> 2x = 50

=> x = 25

Answer 2

x-43=(57-x)-50

x-43=57-x-50

x-43+x=57-50

2x-43=7

   2x=7+43

   2x=50

    x=50:2 

=>    x=25

Vậy x = 25

Answer 3

\(x-43=(57-x)-50\)

\(\Rightarrow x-43=(57-50)-x\)

\(\Rightarrow x-x-43=7\)

\(\Rightarrow2x-43=7\)

\(\Rightarrow2x=7+43\)

\(\Rightarrow2x=50\Rightarrow x=25\)