Question

Resolva as equações abaixo:
a) 3 (2x + 1) + 2 = 2x +4
b) 2x = 15 - 30 - 2x
c) 1/4 + 5 = 2x + 3/4
d) 2 (3x - 5) + 2x + 4 = 8
Me ajudem, por favor!! Preciso muito!

Answer 1

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


2x = 15 - 30 - 2x
2x+2x=15-30
4x=-15
x=-4/15


1/4 + 5 = 2x + 3/4
1+20/4=8x+3/4
21=8x+3
-8x=3-21
8x=-3+21
8x=18
x=18/8
(simplificar por 2)
x=9/4


2 (3x - 5) + 2x + 4 = 8
6x-10+2x+4=8
6x+2x=8+10-4
8x=14
x=14/8
(simplificar por 2)
x=7/4

Answer 2

A)6x+3+2=2x+4
6x-2x=4-3-2
4×=-1
×= -1/4
S=(-1/4)

B)2x+2x=15-30
4x=-15
×=-4/15
S=(-4/15)

C) MMC=(4)
1+20=8x+3
8×=3-20-1
8×=3-21
8×=-18
×=-18/8÷2
×=9/4
S=(9/4)

D)6x-10+2x+4=8
6x+2x=8-4+10
8x=14
x=14/8÷2
x=7/4
S=(7/4)