-( x+84)+213=-16 <=> -x-84+213=-16<=>-84+213+16=x<=>x=145
-(x+84)+213=-16
-(x+84)=-16-213
-(x+84)=-229
-x=-229-84
-x=-313
=>x=313
-(x+84)+213=-16
-(x+84) =-16-213
-(x+84) = -229
=>x+84 =229
x =229-84
x 145
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- ( x + 84 ) + 213 = -16
=> - ( x + 84 ) = -16 - 213 = -229
=> x + 84 = -229
=> x = -229 - 84 = -313
Tìm x biết
- ( x + 84 ) + 213 = - 16
\(\Rightarrow\)x - 84 = -16 -213
x - 84 = -229
x= -229 + 84
x = -145
Vậy x = -145