Kunci Jawaban Matematika Kelas 7 SMP Halaman 106, 107: Persamaan dan Pertidaksamaan

(4) 4x + 12 = 7 - x

Jawaban:
4x + x = 7 - 12
5x = -5
x = -1

(5) 5 - 4x = 2x -1

Jawaban:
-4x - 2x = -1 - 5
-6x = -6
x = 1

(6) 3(x - 5) = -6

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

>>> Halaman 107

Soal 1. Sifat- sifat persamaan

(1) x + 5 = 9 = x = 4
(2) x – 8 = 3 = x = 11
(3) x + 1 = -7 = x = -8
(4) x – 6 = -5 = x = 1
(5) 8x = 48 = x = 6
(6) -2x = 18 = x = -9
(7) -9x = -63 = x = 7
(8) 12x = 20 = x = 5/3
(9) ½ x = 5 = x = 20
(10) x/3 = -2 = x = -6

Soal 2