Question

Contas de X valendo 43 pontos( Contas aqui só para eu ver se fiz certo, por favor me ajudem ♡
A)X+30= 40
B)30-20+2x = 10
C)3x-10+13= -2x+28
D)20x-30=40+30-20
E)-5x+45-89=-90+41
F)20-80+2x=10
G)10x-12+10=18-20
H)10x-20=40+50
I)19+2x-13=10-20
J)13x-23-45=-7x+12
K)5 (3x-2) = 2 ( 6x +3)

Answer 1

A) x + 30 = 40
x = 40 - 30
x = 10

B) 30 - 20 + 2x =10
2x = 10 - 10
2x = 0
x = 0/2
x=0

C) 3x - 10 + 13 = -2x +28
5x = 25
x = 25 / 5
x = 5

D) 20x - 30 = 40 + 30 -20
20x = 80
x = 80/20
x = 4

E) -5x + 45 - 89 = 90 + 41
-5x = 175
x = - 175/ 5
x = -35

F) 20 - 80 + 2x = 10
2x = 70
x = 70/2
x = 35

G) 10 x - 20 = 40 + 50
10x = 110
x = 110 / 10
x = 11

H) 10x - 12 + 10 = 18 -20
10x = 0
x = 0/10
x = 0

I) 19 + 2x - 13 = 10 - 20
2x = - 16
x = -16 /  2
x= -8

J) 13x - 23 - 45 = -7x + 12
20x = 80
x = 80/20
x = 4

K) 5 (3x-2) = 2 ( 6x +3)
15x - 10 = 12x + 6
15x - 12x = 6 + 10
3x = 16
X = 16/3