Resolva as equações:
A) 13(2x – 3) – 5(2 . x) = 5(-3 + 6x)
B) 2(2x + 7) + 3(3 – 5) 3 = 4x + 5 – 1
C) 2 – 7(1 – 2x) = 5- (x + 9)
D ) ( 1 + 3x ) – (1 -2x) + (-11 – 7x) = 5
Soluções para a tarefa
A) 13(2x – 3) – 5(2x) = 5(-3 + 6x)
26x - 39 - 10x = - 15 + 30x
16x - 39 = - 15 + 30x
16x - 30x - 39 +39 = - 15 + 39 + 30x - 30x
- 14x = 24
x = 24/-14
x = 12/-7
B) 2(2x + 7) + 3(3 – 5) 3 = 4x + 5 – 1
4x + 14 + 3(-2)3 = 4x + 4
4x + 14 +(-6)3 = 4x + 4
4x + 14 +(-18) = 4x + 4
4x + 14 - 18 = 4x + 4
4x - 4 = 4x + 4
4x - 4x - 4 + 4 = 4x - 4x + 4 + 4
0x = 8
C) 2 – 7(1 – 2x) = 5- (x + 9)
2 - 7 + 14x = 5 - x - 9
- 5 + 14x = - x - 4
14x + x - 5 + 5 = - x + x - 4 + 5
15x = 1
15x/15 = 1/15
x = 1/15
D ) ( 1 + 3x ) – (1 -2x) + (-11 – 7x) = 5
1 + 3x - 1 + 2x - 11 - 7x = 5
5x - 7x - 11 + 11 = 5 + 11
- 2x = 16
-2x/-2 = 16/-2
x = -8