a,461+(x-45)=387
=>x-45=387-461
=>x-45=-74
=>x=-74+45
x=-29
a, 461 + ( x - 45 ) = 378
( x - 45 ) = 461 - 378
( x - 45 ) = 83
x = 83 - 45
x = 38
a)461+(x-45)=387
(x-45)=387-461
(x-45)=-74
x =-74+45
x =-29
b)11-(-53+x)=97
(-53+x)=11-97
(-53+x)=-86
x =-86--53
x=-33
c)-(x+84)+213=-16
-(x+84) =-16-213
-(x+84) =-229
-x =-229--313
-x =-84
x =84
d|x+3|=7
x+3=7 hoac x+3=-7
x=7-3 x =-7-3
x=4 x =-10
e)|x-5|=(-5)+8
|x-5|=3
x+5=3 hoac x+5=-3
x =3-5 x =-3-5
x =-2 x =-8
1
\(\subset\)