-(2x+24)+211 = - 123
-(2x+24) = -123 - 211
-(2x+24) = - 334
2x+24 = 334
2x = 310
x = 155
-(2x+24)+211=-123
-2x-24+211=-123
-2x+187=-123
-2x=-123-187
-2x=-310
x=-310/-2=155
Vậy 'ba chấm'!
Ta có: \(-\left(2x+24\right)+211=-123\)
\(\Leftrightarrow-2x-24=-123-211\)
\(\Leftrightarrow-2x=-334+24\)
\(\Leftrightarrow-2x=-310\)
\(\Leftrightarrow x=115\)
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