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Simplifying 8z + -5z + -21 = 3(z + -7) Reorder the terms: -21 + 8z + -5z = 3(z + -7) Combine like terms: 8z + -5z = 3z -21 + 3z = 3(z + -7) Reorder the terms: -21 + 3z = 3(-7 + z) -21 + 3z = (-7 * 3 + z * 3) -21 + 3z = (-21 + 3z) Add '21' to each side of the equation. -21 + 21 + 3z = -21 + 21 + 3z Combine like terms: -21 + 21 = 0 0 + 3z = -21 + 21 + 3z 3z = -21 + 21 + 3z Combine like terms: -21 + 21 = 0 3z = 0 + 3z 3z = 3z Add '-3z' to each side of the equation. 3z + -3z = 3z + -3z Combine like terms: 3z + -3z = 0 0 = 3z + -3z Combine like terms: 3z + -3z = 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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