4(x-2)=5(x+3)
4x-8=5x+15
4x-5x=8+15
-x=23
x=-23
vậy ...
4(x - 2) = 5(x + 3)
\(\Leftrightarrow\) 4x - 8 = 5x + 15
\(\Leftrightarrow\) 4x - 5x = 15 + 8
\(\Leftrightarrow\) -x = 23
\(\Leftrightarrow\) x = -23
\(x(-2)=5(x+3)\)
\(4x-8=5(x+3)\)
\(4x-8=5x+15\)
\(4x-8+8=5x+15+8\)
\(4x=5x+15+8\)
\(4x=5x+23\)
\(4x-5x=5x+23-5x\)
\(-x=5x+23-5x\)
\(-x=23\)
\(\dfrac{-x}{-1}=\dfrac{23}{-1}\)
\(x=\dfrac{23}{-1}\)
\(x=-23\)
(biết có zậy)
4(x - 2) = 5(x + 3)
4x - 8 = 5x + 15
4x - 5x = 15 + 8
-x = 23
x = -23
