a = 1/2
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12a- 6a + a = 7a Since they all have the same variable, you can simply add and subtract 12-6 = 6 6+1 = 7
6a
98a + 5 + 6a = 104a + 5
-6a + 8 = 2 -6a = -6 a = 1
6a - 8 - 4a - 2 → 6a - 4a - 8 - 2 → 2a - 10