You cannot solve an expression. And what is given in the question is not an equation since there is no equality, nor two expressions on either side of the equality.
For example
x-3 is an expression and cannot be solved.
x-3 = 2-3x is an equation and can be solved.
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4a + a = 25 add 4a and a 5a = 25 then divide 25 by 5 a = 5
11a+9 = 4a+30 11a-4a = 30-9 7a = 21 Solution: a = 3
4a - 2.1 = 9a + 5.4 4a - 9a = 5.4 +2.1 -5a = 7.5 -a = 1.5 a = -1.5
4a - 9 = 27 4a = 36 a = 9
2a^3=8+4a2a^3-4a-8=0 a^3-2a-4=0 It occurred to me just now by looking at the equation that a=2 would work. And it does. So that's your answer.