(29-х0+(3Х-16)=29-0+3х-16=3х+13
3х=-13
х=-13/3
х=-4 1/3
115-(7Х-3)-(100-8Х)=115-7х+3+100+8х=х+218
х=-218
23х-(2х-17)-(29+8)=23х-2х+17-37=21х-20
21х=20
х=20/21
29-(3Х-11)-(43-7х)+(169-14Х)-(39-8)=29-3х+11+43+7х+169-14х-31=221-10х
-10х=-221
х=221/10
х=22,1