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Simplifying 15z + 21 = 3(5z + -7) Reorder the terms: 21 + 15z = 3(5z + -7) Reorder the terms: 21 + 15z = 3(-7 + 5z) 21 + 15z = (-7 * 3 + 5z * 3) 21 + 15z = (-21 + 15z) Add '-15z' to each side of the equation. 21 + 15z + -15z = -21 + 15z + -15z Combine like terms: 15z + -15z = 0 21 + 0 = -21 + 15z + -15z 21 = -21 + 15z + -15z Combine like terms: 15z + -15z = 0 21 = -21 + 0 21 = -21 Solving 21 = -21 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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