Tolong Jawab no 3 dan 4 pakai cara pleasee

3.)

7x = 7
x = 1
_______
-7x = 7
x = -1

Jadi, jawabannya B. (x = 1 atau x = -1).

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4.)

2x + 4 = 2
2x = -2
x = -1
_________
-2x - 4 = 2
-2x = 6
x = -3

Jadi, jawabannya C. (x = -1 atau x = -3).