2x +1/2=-3
2x=(-3)-1/2
2x=-2,5
x= (-2,5)÷2
x=-1,25
còn lại mk chịu
Cbht
2x + 1/2 = -3
2x = -3 - 1/2
2x = -3 - 0,5
2x = -3,5
x = -3,5 : 2
x = -1,75
b) 3x - 5 = 2x - 6
giả sử x là 5 => 15 - 5 = 10 - 6
=> đề sai
a) \(2x+\frac{1}{2}=-3\)
\(2x=-3-\frac{1}{2}\)
\(2x=-\frac{7}{2}\)
\(x=-\frac{7}{2}:2\)
\(x=-\frac{7}{4}\)
b) \(3x-5=2x-6\)
\(\Rightarrow3x-5-\left(2x-6\right)=0\)
\(3x-5-2x+6=0\)
\(\left(3x-2x\right)+\left(6-5\right)=0\)
\(\left(3-2\right)x+\left(6-5\right)=0\)
\(x+1=0\)
\(x=0-1\)
\(x=-1\)
