(1+1)x2+1+1x5555555
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The person or program that solves the equation does.
It is, in fact, an identity - which is an equation which is true for all values of the variable.
This is an equation of a line. There are an infinite number of solutions which are all points on the line. It is a linear equation.
It is called evaluating the equation.
A proportion is simply a ratio of one number to another. An equation can be any or all of the mathematical operations taking place on numbers or variables.