Question

como e esses cálculos aqui
A) 21x-2=3x+4
B) 12+(x-2)=5(x+3)

Answer 1

A)21x-3x=4+2
18x=6
x=6÷18br /> x=1/3

Answer 2

A) 21x-2=3x+4

21x-3x=4+2

18x=6

x=6/18

x=1/3


B) 12+(x-2)=5(x+3)

12+x-2=5x+15

x-5x=15-12+2

-4x=5

x=-5/4