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The property of equality that is used to solve the equation k - 21 equals -11 is the subtraction property. With this property you would simply add 21 and -11 together to get your answer.
That you can multiply both sides of the equation by any number.Thus, multiplying by 6 gives (x/6)*6 = 7*6 x = 42.
I think it is 3.14 that equals to pi when u solve it
"Inverse Operation(s)"
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It depends on which variable you wish to solve for.