Question

comoo fazer essas contas
a) x-3=20 x= ?
B) 2x=18 x=?
C) x+3 =1 x=?
d) 4x-1=2x+9 x=?
e)5x+3=4x-5 x=?

Answer 1

a)
x - 3 = 20
x = 20 + 3
x = 23

b)
2x = 18
x = 18/2
x = 9

c)
x + 3 = 1
x = 1 - 3
x = - 2

d)
4x - 1 = 2x - 9
4x - 2x = - 9 + 1
2x = - 8
x = - 8/2
x = - 4

e)
5x + 3 = 4x - 5
5x - 4x = - 5 - 3
x = - 8