Question

RESOLVA AS EQUACOES:
3x -21=0
6+x = 6,4
0,5x-9=1,5
4x+3=-19
5x+2=2x-1
6-3x=-10-4x
2(3x-5)=14

Answer 1

3x - 21 = 0
3x = 21
x = 21/3
x = 7

6 + x = 6,4 
x = 6,4 - 6
x = 0,4

0,5x - 9 = 1,5
0,5x = 1,5 + 9
0,5x = 10,5
x = 10,5/0,5
x = 21

4x + 3 = -19
4x = -19 - 3
4x = -22
x = -22/4
x = -5,5

5x + 2 = 2x -1
5x - 2x = -1 -2
3x = -3
x = -3/3
x = -1

6 - 3x = -10 - 4x 
-3x + 4x = -10 - 6
1x = -16
x = -16/1
x = -16

2(3x - 5) = 14
5x - 10 = 14
5x = 14 + 10
5x = 24
x = 24/5
x = 4,8