5x = 250
\frac{-30x^2yz}{36}\div \frac{-5y^2}{7x}
\frac{-10x}{7}\div \frac{7y}{3}
promedio netre 34 mil y 39 mil
\frac{-3m}{2}\div \frac{5m}{9}
-\frac{4b}{5}+2b
\frac{3a}{6}+\frac{3a}{4}
5 : 8 = x : 0.28
\frac{8u^4}{16v}\div \frac{7v^2}{64u}
rearraning equations
