\((2x+3)-13\times40=-18\\\Rightarrow (2x+3)-520=-18\\\Rightarrow2x+3=-18+520\\\Rightarrow 2x+3=502\\\Rightarrow2x=502-3\\\Rightarrow2x=499\\\Rightarrow x=\dfrac{499}{2}\\Vậy:x=\dfrac{499}{2}\)
( 2\(x\) + 3 ) -13 x 40 = -18
( 2\(x\) + 3 ) - 13 = -18 : 40
( 2\(x\) + 3 ) - 13 = -0,45
( 2\(x\) + 3 ) = -0,45 + 13
2\(x\) + 3 = 12,55
2\(x\) = 12,55 - 3
2\(x\) = 9,55
\(x\) = 9,55 : 2
\(x\) = 4,775
Vậy \(x\) = 4,775