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Simplifying 4z + 18 = -2(-2z + -9) Reorder the terms: 18 + 4z = -2(-2z + -9) Reorder the terms: 18 + 4z = -2(-9 + -2z) 18 + 4z = (-9 * -2 + -2z * -2) 18 + 4z = (18 + 4z) Add '-18' to each side of the equation. 18 + -18 + 4z = 18 + -18 + 4z Combine like terms: 18 + -18 = 0 0 + 4z = 18 + -18 + 4z 4z = 18 + -18 + 4z Combine like terms: 18 + -18 = 0 4z = 0 + 4z 4z = 4z Add '-4z' to each side of the equation. 4z + -4z = 4z + -4z Combine like terms: 4z + -4z = 0 0 = 4z + -4z Combine like terms: 4z + -4z = 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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