(780-m*60):6=70; 640:(х*9+8)=8

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To solve the first equation, we need to isolate the variable "m":

(780 - 60m) / 6 = 70
780 - 60m = 420
-60m = -360
m = 6

Now, we can plug the value of m into the second equation to solve for x:

640 / (x9 + 8) = 8
(x9 + 8) = 80
9x + 8 = 80
9x = 72
x = 8

Therefore, the solutions are m = 6 and x = 8.