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Simplifying -9z + (-72) = -9z + -72 -9z + -72 = -9z + -72 Reorder the terms: -72 + -9z = -9z + -72 Reorder the terms: -72 + -9z = -72 + -9z Add '72' to each side of the equation. -72 + 72 + -9z = -72 + 72 + -9z Combine like terms: -72 + 72 = 0 0 + -9z = -72 + 72 + -9z -9z = -72 + 72 + -9z Combine like terms: -72 + 72 = 0 -9z = 0 + -9z -9z = -9z Add '9z' to each side of the equation. -9z + 9z = -9z + 9z Combine like terms: -9z + 9z = 0 0 = -9z + 9z Combine like terms: -9z + 9z = 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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