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Simplifying -7(3x + 9) = -21x + 63 Reorder the terms: -7(9 + 3x) = -21x + 63 (9 * -7 + 3x * -7) = -21x + 63 (-63 + -21x) = -21x + 63 Reorder the terms: -63 + -21x = 63 + -21x Add '21x' to each side of the equation. -63 + -21x + 21x = 63 + -21x + 21x Combine like terms: -21x + 21x = 0 -63 + 0 = 63 + -21x + 21x -63 = 63 + -21x + 21x Combine like terms: -21x + 21x = 0 -63 = 63 + 0 -63 = 63 Solving -63 = 63 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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