Question

Resolva equações:
A) x+8=12                
B) x-4=15c)2x+5=x+3
C) 2x + 5 = x + 3
D) 7x+5=19e)5x-3=7
E) 5x - 3 = 7
F) 8x+5=6x+9
G) 4x-9=2x+5
H) 3(x-4)=x-2
I) 10-6.(x-8)=9=9+x
J) 3x+4+2x=-3+x+4

Answer 1

A)  x + 8 = 12  => x = 12 - 8  =>  x = 4

B) x - 4 = 15   => x = 15 + 4  => x = 19

C) 2x + 5 = x + 3   =>  2x - x = 3 - 5   => x = - 2

D) 7x + 5 = 19   => 7x = 19 - 5   => 7x = 14  => x = 14/7  =>  x = 2

E) 5x - 3 = 7   => 5x = 7 + 3  => 5x = 10  => x = 10/5  => x = 2

F) 8x + 5 = 6x + 9  => 8x - 6x = 9 - 5  => 2x = 4  => x = 4/2  => x = 2

G) 4x - 9 = 2x + 5  => 4x - 2x = 5 + 9   => 2x = 14  => x = 14/2  => x = 7

H) 3( x - 4) = x - 2  => 3x - 12 = x -2  => 3x - x = -2 + 12  => 2x = 10  => x = 5

I) 10 - 6( x - 8 ) = 9 + x  => 10 - 6x + 48 = 9 + x  => - 6x - x = 9 - 58
- 7x = - 48  => 7x = 49  => x = 7

J) 3x + 4 + 2x = 3 + x + 4   => 5x - x = 7 - 4  => 4x = 3  => x = 3/4