4a+5=25
4a=25-5
4a=20
a=20/4
a=5
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4a + a = 25 add 4a and a 5a = 25 then divide 25 by 5 a = 5
5x - 8a + 4a - 2x + a = 3x - 3a
If the question was 3a + 4a - a, the answer is 6a. If the question was something else please resubmit using words eg "plus", "divide", "equals" because the browser used for posting questions does not like symbols!
12a
a=-12