Question 668496
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{{{5/5 - 12/10}}}?
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Create common denominators
{{{(5/5)(2/2) - 12/10}}}
{{{10/10 - 12/10 = -2/10 = highlight_green(-1/5)}}}
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***Note {{{5/5}}} is 1, so 
{{{1 - 12/10}}} is the same as {{{10/10 - 12/10 = -2/10 = -1/5}}}
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