Respuesta :

-4a + 9 = -8-10a -7
-4a+10a=-8-7-9
6a = -24
a = -24 /6
a = -4

Answer:

a=-4

Step-by-step explanation:

  • Expand -2(4+5a)-7:
    -10a-8-7
    -10a-15
  • Subtract 9 from both sides:
    -4a+9-9=-10a-15-9
    -4a=-10a-24
  • Add 10a to both sides:
    -4a+10a=-10a-24+10a
    6a=-24
  • Divide both sides by 6:
    6a÷6=-24÷6
    a=-4

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