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