Question

Variables review find x if:-2×+7=20

Answer 1

Given the following equation:

`-2x+7=20`

to solve for 'x', first we need to substract 7 from both sides of the equation to get:

`\begin{gathered} -2x+7-7=20-7 \\ \Rightarrow-2x=13 \end{gathered}`

next, we can divide both sides by -2 to get the following:

`\begin{gathered} (1)/(-2)\cdot(-2x=13) \\ \Rightarrow(-2)/(-2)x=(13)/(-2) \\ \Rightarrow x=-(13)/(2) \end{gathered}`

therefore, x = -13/2