Question

(3) equação do 1° grau
(a) 69x+3=9x+9
(b) 70x+10=7x+7
(c) 33x+3=3x+6
(d) 84x+4=4x+12
(e) 9x+3=6x-9
(f) 99x+9=9x+18
(g) 106x7=7=6x+17 
(h) 88x+8-8x+4
(i) 95x+10=5x+20
(j) 100x+20=10x+50 

Answer 1

A) 69x + 3 = 9x + 9
    69x - 9x = 9 - 3
    60x = 6
        x = 6/60
        x = 1/10

B) 70x + 10 = 7x + 7
     70x - 7x = 7 - 10
     63x = -3
         x = -3/63
         x = -1/21
 
C) 33x + 3 = 3x + 6
     33x - 3x = 6 - 3
     30x = 3
         x = 1/10
 
D) 84x + 4 = 4x + 12
     84x - 4x = 12 - 4
     80x = 8
         x = 1/10

E) 9x + 3 = 6x - 9
     9x - 6x = -9 + 3
    3x = -6
      x = -2

F) 99x + 9 = 9x + 18
    90x = 18 - 9
        x = 1/10

H) 88x + 8 = 8x + 4
     88x - 8x = 4 - 8
         x = -4/80
         x = -1/20

I) 95x + 10 = 5x + 20
   90x = 10
       x = 1/9

J) 100x + 20 = 10x + 50
     90x = 30
         x = 90/30
         x = 1/3