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Simplifying -3(2z + -7) = -3z + 21 + -3z Reorder the terms: -3(-7 + 2z) = -3z + 21 + -3z (-7 * -3 + 2z * -3) = -3z + 21 + -3z (21 + -6z) = -3z + 21 + -3z Reorder the terms: 21 + -6z = 21 + -3z + -3z Combine like terms: -3z + -3z = -6z 21 + -6z = 21 + -6z Add '-21' to each side of the equation. 21 + -21 + -6z = 21 + -21 + -6z Combine like terms: 21 + -21 = 0 0 + -6z = 21 + -21 + -6z -6z = 21 + -21 + -6z Combine like terms: 21 + -21 = 0 -6z = 0 + -6z -6z = -6z Add '6z' to each side of the equation. -6z + 6z = -6z + 6z Combine like terms: -6z + 6z = 0 0 = -6z + 6z Combine like terms: -6z + 6z = 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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