Question

1) Resolva
A) 3x+4= 7x-2
B) 25+2x= -6x
C) 3/4x+2/3x=12
D) 9x-2 > 0
E) 9/3x+27/3 = 0
F) 3+2x = 5/3 + 4/3x

Answer 1

a) 3x+4 = 7x-2
3x-7x = -2-4
-4x(-1) = -6 (-1)
4x = 6
x = 6/4
x = 3/2

b) 25+2x= -6x
2x-6x= -25
-4x(-1)= -25(-1)
4x= 25
x= 25/4

c) 3/4x+2/3x= 12
3/4(3)x + 2/3(4)x =12
9/12x + 8/12x = 12
17/12x= 12
x= 12.12/17
x= 144/17

d)9x-2>0
9x>2
x>2/9

e)9/3x+27/3=0
9/3x= -27/3
3x= -9
x= -9/-3
x= 3

f)3+2x = 5/3 + 4/3x
2x-4/3x = 5/3-3
2x/1(3) -4/3x(1) = 5/3(1) -3/1(3)
6x/3 -4/3x = 5/3 -9/3
2x/3 = -4/3
x= -4/3.3/2
x= -12/6
x= -2