1. 9-4х=3х-40
-4х-3х=-40-9
7х=49
х=7
2. 0.6х-5.4=-0.8х+5.8
0.6х+0.8х=5.8+5.4
1.4х=11.2
х=8
3. (5х+8)-(8х+14)=9
5х+8-8х-14=9
5х-8х=9+14
-3х=15
х=-5
4. 2.7+3у=9(у-2.1)
2.7+3у=9у-18.9
3у-9у=-18.9-2.7
-6у=-21.6
у=3.6
1. 9-4х=3х-40
-4х-3х=-40-9
7х=49
х=7
2. 0.6х-5.4=-0.8х+5.8
0.6х+0.8х=5.8+5.4
1.4х=11.2
х=8
3. (5х+8)-(8х+14)=9
5х+8-8х-14=9
5х-8х=9+14
-3х=15
х=-5
4. 2.7+3у=9(у-2.1)
2.7+3у=9у-18.9
3у-9у=-18.9-2.7
-6у=-21.6
у=3.6