Question

Calcule as equações e tire prova real:

A)-7x=42

B)3(2x-1)=-2(x+3)

C)x-4/2+x-6/3=12

D)x+2/4+x-2/6=8

E)2(x+7)/6+3x/6=6(x+2)/6

F)x/4=10x/20

G)x+2(x+6)=120

H)x+2(x+3)60

I)3x-1/5=4

J)4x+3/5=-1

Answer 1

A)-7x=42
x= 42/-7
x= -6

B)3(2x-1)=-2(x+3)
6x-3 = -2x-6
6x+2x= -6+3
8x=-3
x=-3/8

C)x-4/2+x-6/3=12
foto

D)x+2/4+x-2/6=8
foto

E)2(x+7)/6+3x/6=6(x+2)/6
foto

F)x/4=10x/20
x/4 ×20 = 10x
5x = 10x
cant be solved

G)x+2(x+6)=120
x+2x+12 = 120
3x= 120-12
3x= 108
x=108/3
x= 36

H)x+2(x+3)=60
x+2x+6 = 60
3x=60-6
3x=54
x=54/3
x= 18


I)3x-1/5=4
3x-1 = 4.5
3x-1 = 20
3x=20+1
3x=21
x=21/3
x=7

J)4x+3/5=-1
4x+3 = -1 . 5
4x+3 =-5
4x=-5-3
4x=-8
x=-8/4
x=-2