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Anyone can, if they know how to do it.

A linear equation describes a straight line.

Its equation contains an equals sign; + and - signs; positive and negative numbers; and a term having x in it, but not x squared or cubed or to any higher power.

So one could look like this: 5x - 3 = 7x - 12, and by using the rule "add the same to both sides or subtract the same from each side the equation can be rewritten as :

(5x -5x) + -3 +12 = 7x - 5x + (-12 +12 ), turning the ones in the brackets to zero, giving 9 = 2x

So 2x = 9 which means that x = 9/2 = 4.5

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