Question

calcule :A) 5x-3=12 B) 4x-12=x C)6x-4(x-5)-(5-3x)=0 D) x+x/4=20​

Answer 1

Olá!

a)

5x - 3 = 12

5x = 12 + 3

5x = 15

 x = $\frac{15}{5}$

 x = 3

b)

4x - 12 = x

4x - x = 12

3x = 12

 x = $\frac{12}{3}$

 x = 4

c)

6x - 4 (x - 5) - (5 - 3x) = 0

6x -4x + 20 - 5 + 3x = 0

6x - 4x + 3x = -20 + 5

2x + 3x = -15

5x = -15

 x = $\frac{-15}{5}$

 x = -3

d)

x + $\frac{x}{4}$ = 20

4x + x = 80

5x = 80

x = $\frac{80}{5}$

x = 16