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Simplifying 10z + 4 = 2(5z + 8) + -21 Reorder the terms: 4 + 10z = 2(5z + 8) + -21 Reorder the terms: 4 + 10z = 2(8 + 5z) + -21 4 + 10z = (8 * 2 + 5z * 2) + -21 4 + 10z = (16 + 10z) + -21 Reorder the terms: 4 + 10z = 16 + -21 + 10z Combine like terms: 16 + -21 = -5 4 + 10z = -5 + 10z Add '-10z' to each side of the equation. 4 + 10z + -10z = -5 + 10z + -10z Combine like terms: 10z + -10z = 0 4 + 0 = -5 + 10z + -10z 4 = -5 + 10z + -10z Combine like terms: 10z + -10z = 0 4 = -5 + 0 4 = -5 Solving 4 = -5 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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