Question

Rozwiąż równania ( proszę z obliczeniami.!)
1) 3(x +1) = 4(x - 1)
2) 7x - 1/2 = 5x + 2/4
3) 3(x - 1) = 4(x + 3)
4) -3(x - 2) = 2(x + 4)
5) 3 - 2(3 - 2x) = 5x
6) 5 - 6(2 - 3x) = 4x
7) 7(x - 1) + 7(-2x) = 3x

Z obliczeniami poproszę.

Answer 1

1) 3(x +1) = 4(x - 1)
3x +3 = 4x -4
7=x

2) 7x - 1/2 = 5x + 2/4
2x = 1
x = 1/2

3) 3(x - 1) = 4(x + 3)
3x - 3 = 4x + 12
-x = 15
x = -15

4) -3(x - 2) = 2(x + 4)
-3x + 6 = 2x + 8
-5x = 2
x = -2/5

5) 3 - 2(3 - 2x) = 5x
3- 6 +4x = 5x
-3 = x

6) 5 - 6(2 - 3x) = 4x
5 - 12 + 18x = 4x
-7 = -14x
x = 1/2

7) 7(x - 1) + 7(-2x) = 3x
7x - 7 - 14x = 3x
7x - 14x - 3x = 7
-10x = 7
x = -0,7