Question

A x+6x=5x+2
B 5x-3(x+2)<15
C 2(x-4)=5x+4
D 7x+8=4x-10

tem que responde tudo pls é urgente

Answer 1

Explicação passo a passo:

A)

$x+6x=5x+2\\x+6x-5x=5x+2-5x\\2x=2\\\frac{2x}{2}=\frac{2}{2}\\x=1$

B)

$5x-3(x+2) < 15 \\5x-3x-6 < 15\\2x-6 < 15\\2x-6+6 < 15+6\\2x < 9\\\frac{2x}{2} < \frac{9}{2}\\x < \frac{9}{2}$

C)

$2(x-4)=5x+4\\2x-8=5x+4\\2x-8-2x=5x+4-2x\\-8=3x+4\\-8-4=3x+4-4\\-12=3x\\\frac{-12}{3}=\frac{3x}{3}\\-4=x$

D)

$7x+8=4x-10\\7x+8-4x=4x-10-4x\\3x+8=-10\\3x+8-8=-10-8\\3x=-18\\\frac{3x}{3}=\frac{-18}{3}\\x=-6$