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In order for us to solve equations we need to write the necessary program ourselves.
To the computer that is just a lot of characters, not meaningful code.
Our program will need to parse out the number literals, the variable, and the operators. Then it would have to know the next step, subtract the 3 from both sides. Then it would have to know to divide both sides by 2. Once only the x exists on the left hand side of the equation, the value on the right hand side will be the solution.
The computer won’t know that it is a rational number, seven over two, though, only that it has a float value of 3.5. In maths, fractions are easier to deal with than decimals since they are exact values.