Question

alguém me ajudar pf ​

Answer 1

a) $\frac{5}{x}-2=\frac{1}{4}$

$\frac{5}{x}-\frac{2x}{x}=\frac{1}{4}$

$\frac{5-2x}{x}=\frac{1}{4}$

$5-2x=\frac{1}{4}.x$

$5-2x=\frac{x}{4}$

$5=\frac{x}{4}+2x$

$5=\frac{x}{4}+\frac{8x}{4}$

$5=\frac{9x}{4}$

$5.4=9x$

$20=9x$

$\frac{20}{9}=x$

$x=\frac{20}{9}$

b) $3bx+6bc=7bx+3bc$

$b(3x+6c)=b(7x+3c)$

$3x+6c=7x+3c$

$3x-7x=3c-6c$

$-4x=-3c$

$4x=3c$

$x=\frac{3c}{4}$