Question

tìm x

15-x=-3

x+(-5)=-5-(9-2)

Answer 1

(*)\(15-x=-3\)

\(\Leftrightarrow-x=-3-15=-18\)

\(\Leftrightarrow x=18\)

(*)\(x+\left(-5\right)=-5-\left(9-2\right)\)

\(\Leftrightarrow x-5=-5-7=-12\)

\(\Leftrightarrow x=-12+5=-7\)

Answer 2

15 - x = -3

x = 15 - ( - 3)

x = 18

x + ( -5) = -5 - (9-2)

x+ ( -5) = -5 - 7

x+ (-5) = - 12

x= - 12 + -5

x = - 17

Answer 3

15 - x = -3

x = 15 - ( -3 )

x = 18

x + ( -5 ) = -5 - ( 9 - 2 )

x + ( -5 ) = -5 - 7

x + ( -5 ) = -12

x = ( -12 ) - ( -5 )

x = -7