Question

A) -2(x-1)-3(x+2)=5
B) 4x-4-5x=-6+90
C) 5x+2(3+x)=5
D) 2(5+x)-10=4
E) x/4 - x/6 = 3
F) x/5 + x/2 = 7/10

Preciso de ajuda

Answer 1

Resposta:

A) $x=-\frac{9}{5}$

B) $x=-88$

C) $x=-\frac{1}{7}$

D) $x=2$

E) $x=36$

F) $x=1$

Explicação passo a passo:

A) $-2\left(x-1\right)-3\left(x+2\right)=5$

$-5x-4=5$

$-5x-4+4=5+4$

$-5x=9$

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

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

B) $4x-4-5x=-6+90$

$4x-5x-4=-6+90$

$-x-4=-6+90$

$-x-4=84$

$-x-4+4=84+4$

$-x=88$

$\frac{-x}{-1}=\frac{88}{-1}$

$x=-88$

C) $5x+2\left(3+x\right)=5$

$7x+6=5$

$7x+6-6=5-6$

$7x=-1$

$\frac{7x}{7}=\frac{-1}{7}$

$x=-\frac{1}{7}$

D) $2\left(5+x\right)-10=4$

$2\left(5+x\right)-10+10=4+10$

$2\left(5+x\right)=14$

$\frac{2\left(5+x\right)}{2}=\frac{14}{2}$

$5+x=7$

$5+x-5=7-5$

$x=2$

E) $\frac{x}{4}-\frac{x}{6}=3$

$\frac{x}{4}\cdot \:12-\frac{x}{6}\cdot \:12=3\cdot \:12$

$x=36$

F) $\frac{x}{5}+\frac{x}{2}=\frac{7}{10}$

$\frac{x}{5}\cdot \:10+\frac{x}{2}\cdot \:10=\frac{7}{10}\cdot \:10$

$7x=7$

$\frac{7x}{7}=\frac{7}{7}$

$x=1$