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Simplifying -12z + 28 = -4(3z + -7) Reorder the terms: 28 + -12z = -4(3z + -7) Reorder the terms: 28 + -12z = -4(-7 + 3z) 28 + -12z = (-7 * -4 + 3z * -4) 28 + -12z = (28 + -12z) Add '-28' to each side of the equation. 28 + -28 + -12z = 28 + -28 + -12z Combine like terms: 28 + -28 = 0 0 + -12z = 28 + -28 + -12z -12z = 28 + -28 + -12z Combine like terms: 28 + -28 = 0 -12z = 0 + -12z -12z = -12z Add '12z' to each side of the equation. -12z + 12z = -12z + 12z Combine like terms: -12z + 12z = 0 0 = -12z + 12z Combine like terms: -12z + 12z = 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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