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Simplifying -7z + -8z + 12 = -3(5z + -4) Reorder the terms: 12 + -7z + -8z = -3(5z + -4) Combine like terms: -7z + -8z = -15z 12 + -15z = -3(5z + -4) Reorder the terms: 12 + -15z = -3(-4 + 5z) 12 + -15z = (-4 * -3 + 5z * -3) 12 + -15z = (12 + -15z) Add '-12' to each side of the equation. 12 + -12 + -15z = 12 + -12 + -15z Combine like terms: 12 + -12 = 0 0 + -15z = 12 + -12 + -15z -15z = 12 + -12 + -15z Combine like terms: 12 + -12 = 0 -15z = 0 + -15z -15z = -15z Add '15z' to each side of the equation. -15z + 15z = -15z + 15z Combine like terms: -15z + 15z = 0 0 = -15z + 15z Combine like terms: -15z + 15z = 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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