Question

Resolva a equação
A) 21 -10=11x

B)4x +2x -8=15 +3

C)10x -20= -20x +30

D)18x=21x -19x +5 -3

E)x +2= -x -2

Answer 1

A)
21 -10=11x
11 = 11x
11x = 11
x = 11/11
x = 1

B)
4x +2x - 8=15 +3
6x - 8 = 18
6x = 18+8
6x = 26 (:2)
3x = 13
x = 13/3

C)
10x -20= -20x +30
10x +20x = 30+20
30x = 50 (:10)
3x = 5
x = 5/3

D)
18x=21x -19x +5 -3
18x = 2x + 2
18x - 2x = 2
16x = 2 (:2)
8x = 1
x = 1/8

E)
x + 2= - x - 2
x + x = - 2 - 2
2x = - 4
x = - 4/2
x = - 2