Question

Resolva as equações de primeiro grau. 
a)18-4x-x=+3x-7
b)5X-4-2=X-5+1
c)-3X+4=-5-x
d)20-x+2x=-3x+4
e)18x-4x-10=+10+5x-2
f)15x+3=-4x-3x+2

Answer 1

a) 18 - 4x - x = 3x - 7
- 4x - x - 3x = - 7 - 18
- 8x = - 25 (-1)
8x = 25
x = 25/8

b) 5x - 4 - 2 = x - 5 + 1
5x - x = - 5 + 1 + 4 + 2
4x = 2
x = 2/4
x = 1/2

c) - 3x + 4 = - 5 - x
- 3x + x = - 5 - 4
- 2x = - 9 (-1)
2x = 9
x = 9/2

d) 20 - x + 2x = - 3x + 4
- x + 2x + 3x = 4 - 20
4x = - 16
x = - 16/4
x = - 4

e) 18x - 4x - 10 = 10 + 5x - 2
18x - 4x - 5x = - 2 + 10 + 10
9x = 18
x = 18/9
x = 2

f) 15x + 3 = - 4x - 3x + 2
15x + 4x + 3x = 2 - 3
22x = - 1
x = - 1/22

Answer 2

A)-4X-X-3X=-7-18
X=0
B)5X-X=4+2-5+1
4X=2
X=4/2
X=2
C)-3X+X=-4-5
-2X=-9
X=9/2
D) -X+2X+3X=-20+4
4X=-16
X=-16/4
X=-4
E)18X-4X-5X=10+10-2
9X=20
X=20/9
F)15X+4X+3X=-3+2
22X=-1
X=-1/22