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2. y = 7-15 = -8
3. q = 9
4. -2y + 10 = 2
5. -2x = -7-9
-2x = -16
x = =-16/-2 = 8
jadi, bentuk yg paling sederhana : 2x = 16
6. 3a + a = 31-7
4a = 24
a = 24/4 = 6