Formulas like and describe the same relatonship, they are equivalent. You can reduce (or rewrite ) the formula :
both sides
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both sides
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has now been expressed in . The new formula contains fewer symbols and looks neater.
When rewriting formulas you use the following principles:
you may add or subtract the same from both sides of an equals sign;
you may divide or multiply with the same number on both sides of an equals sign (except
for multiplying or dividing by );
removing brackets:
and
factorizing:
and
with and
adding/subtracting/multiplying and dividing fractions:
and
and
if
, (only when dividing) and