Question

80-x=35.5

x/5+10=30

56-3x=38

Answer 1

$80-x = 35,5 \\ \\ 80= 35,5 + x \\ \\ 80 - 35,5=x \to \boxed{44,5=x} \\ \\ \\ \frac{x}{5} + 10 = 30 \\ \\ \frac{x}{5}= 30-10 \\ \\ \frac{x}{5}= 20\to x= 20*5\to \boxed{x=100}$

$56-3x=38 \\ \\ 56=38+3x \\ \\ 56-38= 3x \\ \\ 18=3x \to \frac{18}{3}=x \to \boxed{6=x}$

Espero que te sirva, salu2!!!!