Respuesta :

After combining like terms:
-0.7k + 1 = 7.8
Subtract the 1 from both sides:
-0.7k = 6.8
Divide by -0.7 from both sides:
k = -9.7142, simplified is -9.7

Checked Answer:
-0.7(-9.7) = 6.79, simplified is 6.8