Hello there!
[tex]3x+7=-x-1\\[/tex]
Explanation:
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First you had to subtract by 7 from both sides of the equation.
[tex]3x+7-7=-x-1-7[/tex]
Simplify
[tex]3x=-x-8[/tex]
Then you add by x from both sides of the equation.
[tex]3x+x=-x-8+x[/tex]
Simplify
[tex]4x=-8[/tex]
Divide by 4 from both sides of the equation.
[tex]\frac{4x}{4}=\frac{-8}{4}[/tex]
Simplify it should be the correct answer.
[tex]x=-2[/tex]
Answer⇒⇒⇒x=-2
Hope this helps!
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-Charlie