Question

Equação de primeiro grau
16x-6-7x=15+2x

X-3=6+4x

7x+5-x+8=3

5.(3-2x)=55

Answer 1

Olá,

Vamos lá,

16x-6-7x=15+2x
16x -7x-2x=15+6
7x=21
x=21/7
x=3


X-3=6+4x
x-4x=6+3
-3x=9  *(-1)
3x=-9
x=-9/3
x=-3


7x+5-x+8=3
6x=3 -5-8
6x=-10
x=-10/6
x=-5/3

5.(3-2x)=55
15 -10x=55
-10x=55-15
-10x=40  *(-1)
10x=-40
x=-40/10
x=-4

Answer 2

16x - 6 - 7x = 15 + 2x
9x - 6 = 15 + 2x
9x - 2x = 15 + 6
7x = 21
x = 21/7
x = 3

x - 3 = 6 + 4x
- 3 - 6 = 4x - x
 - 9 = 3x
3x = - 9
x = - 9/3
x = - 3

7x + 5 - x + 8 = 3
6x + 13 = 3
6x = 3 - 13
6x = - 10
x = - 10  (:2)
        ------
          6   (:2)

x =  - 5
       -----
         3

5.(3 - 2x) = 55
15 - 10x = 55
15 - 55 = 10x
- 40 = 10x
10x = - 40
x = - 40/10
x = - 4