1. kerjakan dgn cara menambah atau mengurangi kedua ruas dgn bilangan yang sama a. x + 5 = -12 b. x - 9 = sepuluh c. y - 27= -18 d. 7y + 12 = 6y e. 7p + 3per7

x + 5 = -12
x + 5 - 5 = -12 - 5
x = -17

x - 9 = 10
x - 9 + 9 = 10 + 9
x = 19

y - 27 = -18
y - 27 + 27 = -18 + 27
y = 9

7y + 12 = 6y
7y + 12 - 12 = 6y - 12
7y = 6y - 12
7y - 6y = 6y - 12 - 6y
y = -12

7p + 3/7 = 8p + 5/7
7p + 3/7 - 7p = 8p + 5/7 - 7p
3/7 = p + 5/7
3/7 - 5/7 = p + 5/7 - 5/7
-2/7 = p