Question

Resolva as equações (com conta) :
A)3x-7=2x+5
B)7x+8=4x-10
C)4x-15=2x+3
D)2x-4-8=4x
E)3x=x+1+7
F)360+36x=30x
G)2x+5-5x= -1
H)5+6x=5x+2
I)x+2x-1-3=x
J)-3x+10=2x+8+1

Answer 1

Explicação passo-a-passo:

A. 3X-7=2X+5

3X-2X=5+7

X=12;

B. 7X+8=4X-10

7X-4X=-10-8

3X=-18

X=-18÷3

X= -6;

C. 4x-15=2x+3

4X-2X=3+15

2X=18

X=18÷2

X= 9;

D. 2x-4-8=4x

2X-12=4X

4X=2X-12

4X-2X= -12

2X=-12

X= -12÷2

X= -6;

E. 3x=x+1+7

3X-X=8

2x=8

x=8÷2

x=4;

F. 360+36x=30x

30x=36x+360

30x-36x= 360

( -1) -6x=360 (-1)

6x= -360

x= -360÷6

x= -60;

G. 2x+5-5x= -1

-3x+5= -1

(-1) -3x= -4 (-1)

3x=4

x=4/3;

H. 5+6x=5x+2

6x-5x=2-5

x= -3;

I. x+2x-1-3=x

3x-4=x

3x-x= +4

2x=4

x= 4÷2

x= 2;

J. -3x+10=2x+8+1

-3x+(-2x)= 9-10

( -1) -5x= -1 ( -1)

5x=1

x= 1/5;