...............................................

`1)5(x-7)=0`

`x-7=0`

`x=0+7`

`x=7`

`-` Vậy : `x=7.`

`·········`

`2)25(x-4)=0`

`x-4=0`

`x=0+4`

`x=4`

`-` Vậy : `x=4.`

`·········`

`3)34(2x-6)=0`

`2x-6=0`

`2x=6`

`x=6:2`

`x=3`

`-` Vậy : `x=3.`

`········`

`4)2007(3x-12)=0`

`3x-12=0`

`3x=12`

`x=12:3`

`x=4`

`-` Vậy : `x=4.`

`········`

`5)47(5x-15)=0`

`5x-15=0`

`5x=15`

`x=15:5`

`x=3`

`-` Vậy  :`x=3.`

`·········`

`6)13(4x-24)=0`

`4x-24=0`

`4x=24`

`x=24:4`

`x=6`

`-` Vậy : `x=6.`

`·········`

`7)49(6x-12)=0`

`6x-12=0`

`6x=12`

`x=12:6`

`x=2`

`-` Vậy : `x=2.`

`·········`

`8)17(15x-45)=0`

`15x-45=0`

`15x=45`

`x=45:15`

`x=3`

`-` Vậy : `x=3.`

`········`

`9)105(17x-34)=0`

`17x-34=0`

`17x=34`

`x=34:17`

`x=2`

`-` Vậy : `x=2.`

`·······`

`10)57(9x-27)=0`

`9x-27=0`

`9x=27`

`x=27:9`

`x=3`

`-` Vậy : `x=3.`

`········`

`11)25+(15-x)=30`

`15-x=30-25`

`15-x=5`

`x=15-5`

`x=10`

`-` Vậy : `x=10.`

`·········`

`12)43-(24-x)=20`

`24-x=43-20`

`24-x=23`

`x=24-23`

`x=1`

`-` Vậy : `x=1.`

`·········`

`13)2(x-5)-17=25`

`2x-2.5=25+17`

`2x-10=42`

`2x=42+10`

`2x=52`

`x=52:2`

`x=26`

`-` Vậy : `x=26.`

`·········`

`14)3(x+7)-15=27`

`3x+3.7=27+15`

`3x+21=42`

`3x=42-21`

`3x=21`

`x=21:3`

`x=7`

`-` Vậy : `x=7.`

`#Sal_tSea`