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Simplifying 7(6 + -9) = -21 Combine like terms: 6 + -9 = -3 7(-3) = -21 Multiply 7 * -3 -21 = -21 Add '21' to each side of the equation. -21 + 21 = -21 + 21 Combine like terms: -21 + 21 = 0 0 = -21 + 21 Combine like terms: -21 + 21 = 0 0 = 0 Solving 0 = 0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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