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Transitive property of equality
symmetric property of equality
Addition Property of Equality (APOE)
Without an equality sign it is not an equation.
Isolate the variable. Get it by itself. 9+11x=89+x 9+11x-1x=89+x-1x Subtraction property of equality 9+10x=89 9+10x-9=89-9 subtraction property of equality 10x=80 x=8 division property of equality.