-11-(19-x)=50
=> -11 -19+x=50
=> -30+x=50
x=-30-50
x=-80
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-11-(19-x)=50
19-x=(-11)-50
19-x=-61
x=19-(-61)
x=80
=>-11-19+x=50
-19+x=50+11
-19+x=61
x=61+19
x=80
-11-( 19 - x ) =50
19 - x =-11-50
19-x =-61
x =19--61
x =80