Question

Resolva as equações em R:

a)3(x+4)+2.(2x+1)=4.(12+3x)

b)32/5+x/4= 2x+10

c)4.(2x+2+3x)=x+4

d)2x+1/2+x-1/3 =12

e)2.(2+3x)/5 =24

f) 21x+14=7x+28

g)34+2(3x+4) = 12-10x

obrigado a todos que me ajudem nisso galera agradeço!!

Answer 1

a)3(x+4)+2.(2x+1)=4.(12+3x)
3x+12+4x+2=48+12x
7x-12x=48-14
-5x=34 (-1)
x=-34/5
x=-6,8

b)32/5+x/4= 2x+10
x/4-2x=10-32/5 mmc 20
5x-40x=200-128
-35x=72 (-1)
x=-72/35

c)4.(2x+2+3x)=x+4
8x+8+12x=x+4
20x-x=4-8
19x=-4
x=19/4
x=4,75

d)2x+1/2+x-1/3 =12
3x=12-1/2+1/3 mmc= 6
18x=72-3+2
18x=71
x=71/18

e)2.(2+3x)/5 =24
(4+6x)/5=24  mmc=5
4+6x=120
6x=116
x=116/6 = 58/3

f) 21x+14=7x+28
21x-7x=14
14x=14
x=1

g)34+2(3x+4) = 12-10x
10x+6x+8=12-34
16x=28
x=28/16 = 7/4