Question

6×+6=2×+18 (com conta)
2×-5=×+1
2×+3=×+4
5×+7=4×+10
4×-10=2×+2
9×+9=3×+15

Answer 1

6x + 6 = 2x + 18
6x + 2x = 18 - 6
8x = 12
x = 12 : 8
x = 1,5

2x - 5 = x + 1
2x - x = 5 + 1
x = 6

2x + 3 = x + 4
2x - x = 4 - 3
x = 1

5x + 7 = 4x + 10
5x - 4x = 10 - 7
x = 3

4x - 10 = 2x + 2
4x - 2x = 2 - 10
2x = - 8
x = -8 : 2
x = - 4

9x + 9 = 3x + 15
9x - 3x = 15 - 9
6x =6
x = 6 : 6
x = 1