Question

A) 2x+5=20 (equaçao em Q)
B) 40x+21=61
C) 2x+5= x/2
Montem a conta tbm!

Answer 1

A) 2x+5=20
    2x=20-5
    2x=15
    x=15
         2
    x = 7,5

B ) 40x+21=61
     40x=61-21
     40x=40
        x= 40
             40
        x=1

C) 2x+5= x 
              2
 4x+10=x
 4x-x=-10
 3x=-10
   x=10
        3
    
 

Answer 2

a) $2x+5=20$

$2x=20-5$

$2x=15$

$\boxed{x=\dfrac{15}{2}}$


b) $40x+21=61$

$40x=61-21$

$\not40x=\not40$

$\boxed{x=1}$


c) $2x+5=\dfrac{x}{2}$

$2(2x+5)=x$

$4x+10=x$

$4x-x=-10$

$3x=-10$

$\boxed{x=-\dfrac{10}{3}}$