Question

Calcule mentalmente o valor de x
4 (x+3)=3 (2x+6)
1,4x-12=6x+18
2,4x-6x=18-12
3, 2x=6
4,x÷6/+2
5,x=3

Answer 1

4× + 12 = 6× + 18
2× = - 6
× = - 3

4,6× = - 30
× = - 30 / 4,6
× = - 6,52..

- 3,6× = 6
× = - 6 / 3,6
× = - 1,67

× = 6 / 3,2
× = 1,875

....

× = 3 / 5
× = 0,6