Evaluate -2/7-1/21

Math
-27-121
To write -27 as a fraction with a common denominator, multiply by 33.
-27⋅33-121
Write each expression with a common denominator of 21, by multiplying each by an appropriate factor of 1.
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Multiply 27 and 33.
-2⋅37⋅3-121
Multiply 7 by 3.
-2⋅321-121
-2⋅321-121
Combine the numerators over the common denominator.
-2⋅3-121
Simplify the numerator.
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Multiply -2 by 3.
-6-121
Subtract 1 from -6.
-721
-721
Cancel the common factor of -7 and 21.
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Factor 7 out of -7.
7(-1)21
Cancel the common factors.
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Factor 7 out of 21.
7⋅-17⋅3
Cancel the common factor.
7⋅-17⋅3
Rewrite the expression.
-13
-13
-13
Move the negative in front of the fraction.
-13
The result can be shown in multiple forms.
Exact Form:
-13
Decimal Form:
-0.3‾
Evaluate -2/7-1/21

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