12
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3a=1divide both sides by 3a=1/3
2a + 3a + 4 = 5a + 4
a = 3a + 4 0 = 2a + 4 2a = -4 a = -2
12+1.5a = 3a 12 = 3a-1.5a 12 = 1.5a Divide both sides by 1.5 to find the value of a: a = 8
3a + 4 = 4a - 3 4 = a -3 (subtract 3a from each side) 7 = a (add 3 to both sides) a = 7