unbiased.
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Parallel sides are lines that remain the same distance apart.
The size of the quantities involved doesn't matter. As long as you add or subtract (or divide or multiply) the same number to or from both sides of the equation, then the two sides remain equal.
Yes, that is correct. That is the beuty of algebr a- whatever you do to one side of the equation you do to the other and the sides remain equal. The word algebra comes form the Arabic "al jabr" which means, roughly, "what I do to one side I do to the other"
to be neutral
Take your choice from a square, a rhombus, a parallelogram or a rectangle.