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Verified answer
1). -3 - x = 10-3 -10 =x
-13 = x
2). 3x = 9
x = 9/3
x= 3
3). -3x = 9
x = 9/-3
x = -3
Matematika SMP Kelas VII
1] -3 - x = 10
-x = 10 + 3
x = -13
2] 3x = 9
x = 9/3
x = 3
3] -3x = 9
x = 9 : (-3)
x = -3