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Simplifying 3(4z + -7) = -12 + 12z Reorder the terms: 3(-7 + 4z) = -12 + 12z (-7 * 3 + 4z * 3) = -12 + 12z (-21 + 12z) = -12 + 12z Add '-12z' to each side of the equation. -21 + 12z + -12z = -12 + 12z + -12z Combine like terms: 12z + -12z = 0 -21 + 0 = -12 + 12z + -12z -21 = -12 + 12z + -12z Combine like terms: 12z + -12z = 0 -21 = -12 + 0 -21 = -12 Solving -21 = -12 Couldn't find a variable to solve for. This equation is invalid, the left and right sides are not equal, therefore there is no solution.
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