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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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