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----------- × 3
6 - 2a = 12
6 - 12 = 2a
-6 = 2a
-3 = a
b) 3/4 (a+3) + 1/2 (a-1) = 0
3/4a + 9/4 + 1/2a - 1/2 = 0
------------------------- ×4
3a + 9 + 2a - 2 = 0
3a + 2a + 9 - 2 = 0
5a + 7 = 0
5a = -7
a = -7/5