2a+5a=3
7a=3
a=3/7 or .4286
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a=5
-2a + 5 = 1 -2a = -5 + 1 -2a = -4 a = -4/-2 a = 2
6
Not sure why it is 3a2- if you mean 3*a*2, then: 3*a*2=6a (6a-2a)+5-2(a (or a2)+a)=1 4a+5-(2a+a)=1 4a+5-2a-a=1 Then take the 5 over (remember, the +5 become -5 when transposed): 4a-2a-a=1-5 Solving the equations on both sides gives: a=-4 Is this your answer?
depends what 'a' =