2*(x-5)-17=25
=>2*(x-5)=25+17
=>2*(x-5)=42
=>x-5=42:2
=>x-5=21
=>x=21+5
=>x=26.
3*(x+7)-15=27
=>3*(x+7)=27+15
=>3*(x+7)=42
=>x+7=42:3
=>x+7=14
=>x=14-7
=>x=7
2 nhan (x-5)-17=25
2 nhan (x-5)=25+17
2 nhân(x+5)=42
x-5=42:2
x-5+21
x=21+5
x=26
3 nhân(x+7)-15=27
3 nhân(x+7) =27+15
3 nhân(x+7) =42
(x+7) =42:3
(x+7) =14
x=14-7
x=7
a) 2 . ( x - 5 ) - 17 = 25
2 . ( x - 5 ) = 25 + 17
2 . ( x - 5 ) = 42
x - 5 = 42 : 2
x - 5 = 21
x = 21 + 5
x = 26
b) 3 . ( x + 7 ) - 15 = 27
3 . ( x + 7 ) = 27 + 15
3 . ( x + 7 ) = 42
x + 7 = 42 : 3
x + 7 = 14
x = 14 - 7
x = 7
2 * ( x - 5 ) - 17 = 25
=> 2 * ( x - 5 ) = 25 + 17
=> 2 * ( x - 5 ) = 42
=> x - 5 = 42 : 2
=> x - 5 = 21
=> x = 21 + 5
=> x = 26
3 * ( x + 7 ) - 15 = 27
=> 3 * ( x + 7 ) = 27 + 15
=> 3 * ( x + 7 ) = 42
=> x + 7 = 42 : 3
=> x + 7 = 14
=> x = 7
2 * ( x - 5 ) - 17 = 25
=> 2 * ( x - 5 ) = 25 + 17
=> 2 * ( x - 5 ) = 42
=> x - 5 = 42 : 2
=> x - 5 = 21
=> x = 21 + 5
=> x = 26
3 * ( x + 7 ) - 15 = 27
=> 3 * ( x + 7 ) = 27 + 15
=> 3 * ( x + 7 ) = 42
=> x + 7 = 42 : 3
=> x + 7 = 14
=> x = 7
\(\text{2 * ( x - 5 ) - 17 = 25 }\)
=> 2 * ( x - 5 ) = 25 + 17
=> 2 * ( x - 5 ) = 42
=> x - 5 = 42 : 2
=> x - 5 = 21
=> x = 21 + 5
=> x = 26
3 * ( x + 7 ) - 15 = 27
=> 3 * ( x + 7 ) = 27 + 15
=> 3 * ( x + 7 ) = 42
=> x + 7 = 42 : 3
=> x + 7 = 14
=> x = 7