a) 2x + 6 = 12
2x = 6
x = 3
b) ( 3x + 3 ) - 5 = 13
3x + 3 = 18
3x = 15
x = 5
Vậy,...........
\(\left(2x\right)+6=12\) \(\left(3x+3\right)-5=13\)
\(2x=12-6\) \(3x+3=13+5\)
\(2x=6\) \(3x+3=18\)
\(x=6:2\) \(3x=18-3\)
\(x=3\) \(3x=15\Rightarrow x=5\)
\(2x+6=12\)
\(\Leftrightarrow2x=12-6=6\)
\(\Leftrightarrow x=3\)
\(\left(3x+3\right)-5=13\)
\(3x+3=13+5=18\)
\(3x=18-3=15\)
\(x=5\)
\(\left(2x\right)+6=12\)
\(\Rightarrow2x\) \(=12-6\)
\(\Rightarrow2x\) \(=6\)
\(\Rightarrow x\) \(=6:3\)
\(\Rightarrow x\) \(=3\)
Vậy \(x=3\)
\(\left(3x+3\right)-5=13\)
\(\Rightarrow3x+3\) \(=13+5\)
\(\Rightarrow3x+3\) \(=18\)
\(\Rightarrow3x\) \(=18-3\)
\(\Rightarrow3x\) \(=15\)
\(\Rightarrow x\) \(=15:3\)
\(\Rightarrow x\) \(=5\)
Vậy \(x=5\)
a)(2x)+6=12
2x=12-6
2x=6
x=6:2
x=3
b)(3x+3)-5=13
(3x+3)=18
3x=15
x=15:3
x=5
(2x)+6=12 (3x+3)-5=13
2x=12-6 3x+3=13+5
2x=6 3x+3=18
x=3 3x=15
x=5