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i dont understand what you mean by symbolic but ill just do an example
2a + 3 = 4 - 5a
first collect like terms
2a +3 -3 = 4 -3 -5a
2a = 4-3 - 5a
2a + 5a = 1 - 5a + 5a
2a + 5a = 1
7a = 1
divide both sides by the coefficient of the unknwown(i.e. the number in front of the letter)
7a/7 = 1/7
a = 1/7
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