Question

Bank o detetive encontre o número desconhecido: ​

Answer 1

Resposta:

Explicação passo a passo:

$A)$

$3x-6=9$

$3x=9+6$

$3x=15$

$x=15/3$

$x=5$

$B)$

$2x+7=21$

$2x=21-7$

$2x=14$

$x=14/2$

$x=7$

$C)$

$\frac{x}{2}+12=30$

$\frac{x}{2}=30-12$

$\frac{x}{2}=18$

$x=2\:.\:18$

$x=36$

$D)$

$2x+10=30$

$2x=30-10$

$2x=20$

$x=20/2$

$x=10$

$E)$

$3x-25=35$

$3x=35+25$

$3x=60$

$x=60/3$

$x=20$

$F)$

$5x+25=275$

$5x=275-25$

$5x=250$

$x=250/5$

$x=50$