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Simplifying 7(-1x + 3) = -7x + -21 Reorder the terms: 7(3 + -1x) = -7x + -21 (3 * 7 + -1x * 7) = -7x + -21 (21 + -7x) = -7x + -21 Reorder the terms: 21 + -7x = -21 + -7x Add '7x' to each side of the equation. 21 + -7x + 7x = -21 + -7x + 7x Combine like terms: -7x + 7x = 0 21 + 0 = -21 + -7x + 7x 21 = -21 + -7x + 7x Combine like terms: -7x + 7x = 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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