bai 1 : tim x
a,x-7 = -5 A. |x+2| = 0 1. (3x-2^4 ).7^3 =2.7^4
b 128-3.(x=4)=23 B.|x-5|=|-7| 2 . x-[42+(-28)]=-8
c , [ (6x-39):7 ] .4 =12 C.|X-3|=7 - (-2) 3 . |x-3| = |5|+|7|
d,(x:3-4).5=15 D . (7-x)-(25+7) =-25 4 . 15 - 2|x| = 13
E . |x|-5 = 3 5 . 4- (7-x)=x-(13-4)