Question

observe e resolva as equações, sendo x um número racional.
a) 7x - 1 = 13
b) 6x = 2x + 28
c) 5x - 2 = 18 + 3x
d) 6x - 10 = 2x
e) 12x - 4 = 10x + 3
f) 5x - 2 = 3x + 7+ 6
g) 9 - x + 2 = 5x + 3 + 2x
h) -x - 2x - 4 = 11

Answer 1

a) 7x - 1 = 13 ...........7x = 14....... x = 2

b) 6x = 2x + 28 .... 6x - 2x=28.......4x = 28.....x = 7

c) 5x - 2 = 18 + 3x ...... 5x-3x = 18+2........2x=20.....x=10

d) 6x - 10 = 2x ........6x -2x =10........4x=10......x=2,5

e) 12x - 4 = 10x + 3 ..........12x - 10x = 3+4.....2x= 7....x=3,5

f) 5x - 2 = 3x + 7+ 6..... 5x-3x= 7+6+2....2x = 15.......x= 7,5 

g) 9 - x + 2 = 5x + 3 + 2x......-x - 5x-2x=3-9-2............-8x=-8.......x =1

h) -x - 2x - 4 = 11............. -x-2x= 11+4.......-3x=15........x= -5