Question

caucule o valor de X, nas equacoes:
a) 6x + 3= 3x +9
b)5x=10
c)3x +6=6x -1

Answer 1

a) 6x + 3= 3x +9
6x - 3x = 9 - 3
3x = 6
x = 6 / 3
x = 2

b)5x=10
x = 10 / 5
x = 2 

c)3x +6=6x -1
3x - 6x = - 1 - 6
-3x = -7
x = -7 / -3
x = 7/3

Answer 2

a) 6x + 3 = 3x + 9
$6x + 3 = 3x + 9 \\ 6x - 3x = 9 - 3 \\ 3x = 6 \\ x = 6 \div 3 \\ x = 2$

b) 5x = 10
$5x = 10 \\ x = 10 \div 5 \\ x = 2$

c) 3x + 6 = 6x - 1
$3x + 6= 6x - 1 \\ 3x - 6x = -1 -6 \\ -3x = -7 \\ x = \frac{-7}{-3} \\ x = \frac{7}{3}$