Question

1 ) calcule os valores de ×.
A ) 5×+10>×+7
B ) 3×+7=×-21
C ) 1-4×<2×-5

Answer 1

A)
5x + 10 > x +7
5x - x > 7 - 10
4x > -3
x > -3/4

B)
3x + 7 = x - 21
3x - x = -21 - 7
x = -28 / 3

C) 
1-4x < 2x - 5
-4x - 2x < -5 -1
-6x < -6  (-1)
6x < 6
x < 6 / 6
x< 1