Question

3.4=x.5, como acho o valor de "x"

Answer 1

X=-3.-4.5
X=+12.5
X=60

Answer 2

Se 3×4=5×X
$3 \times 4 = 12 \\ 5 \times x = 5x \\ 12 = 5x \\ x = \frac{12}{5} \\ x = 2.4 \: se \: quiser$