Question

considerando u =r determine a solucao das seguintes equacoes do 1 grau com uma incognita:

A :21x -17=109

B: 73x +100=53x

C:1,7+2,5x=4,2

D: 23x-22=19x+6

E: 12x-3,6=x-10,8
F: 1,9x-3,6=x-10,8
G :10(x+1)_5(x-2)=70

H :5 (x+2)-13=2(3x-1)

I : 7(2x)=5x-1,2)+35

J : 3(x+1)-2(x-1)=-(x+5)​

Answer 1

A :21x -17=109

21x = 126

X = 126/21

X = 6

B: 73x +100=53x

20x = -100

X = -100/20

X = -5

C:1,7+2,5x=4,2

2,5x = 2,5

X = 2,5/2,5

X = 1

D: 23x-22=19x+6

4x = 28

X = 28/4

X = 7

E: 12x-3,6=x-10,8

11x = -7,2

X = -7,2/11

X = -0,654

F: 1,9x-3,6=x-10,8

0,9x = -7,2

X = -7,2/0,9

X = -8

G :10(x+1)_5(x-2)=70

10x + 10 -5x + 10 = 70

5x = 50

X = 50/5

X = 10

H :5 (x+2)-13=2(3x-1)

5x + 10 -13 = 6x -2

X = -1

I : 7(2x)=5x-1,2)+35

14x = 5x + 33,8

9x = 33,8

X = 33,8/9

X = 3,75

J : 3(x+1)-2(x-1)=-(x+5)​

3x + 3 -2x + 2 = -x - 5

2x = -10

X = -10/2

X = -5