Respuesta :

arabellasdt

Answer:

-7

Step-by-step explanation:

first multiply 3 and 4 because PEMDAS

so it now looks like

12 - 9 - x = 10

now minus 12 and 9

3 - x = 10

move x to the other side by adding x to both sides

3 = 10 + x

and move 10 to the other side by subtracting  10 to both sides

3 - 10 = x

x = -7

now check

3*4 - 9 - (-7) = 10 ?

12 - 9 + 7 = 10 ?

3 + 7 = 10 ?

10 = 10

bignastyjack

Step-by-step explanation:

[tex]3\cdot \:4+\left(-9\right)-x=10[/tex]

[tex]\mathrm{Remove\:parentheses}:\quad \left(-a\right)=-a[/tex]

[tex]3\cdot \:4-9-x=10[/tex]

[tex]\mathrm{Multiply\:the\:numbers:}\:3\cdot \:4=12[/tex]

[tex]12-9-x=10[/tex]

[tex]\mathrm{Subtract\:the\:numbers:}\:12-9=3[/tex]

[tex]-x+3=10[/tex]

[tex]\mathrm{Subtract\:}3\mathrm{\:from\:both\:sides}[/tex]

[tex]-x+3-3=10-3[/tex]

[tex]Simplify[/tex]

[tex]-x=7[/tex]

[tex]\mathrm{Divide\:both\:sides\:by\:}-1[/tex]

[tex]\frac{-x}{-1}=\frac{7}{-1}[/tex]

[tex]Simplify[/tex]

[tex]x=-7[/tex]

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