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Simplifying 21 + -6x = -3x + -3(x + -6) Reorder the terms: 21 + -6x = -3x + -3(-6 + x) 21 + -6x = -3x + (-6 * -3 + x * -3) 21 + -6x = -3x + (18 + -3x) Reorder the terms: 21 + -6x = 18 + -3x + -3x Combine like terms: -3x + -3x = -6x 21 + -6x = 18 + -6x Add '6x' to each side of the equation. 21 + -6x + 6x = 18 + -6x + 6x Combine like terms: -6x + 6x = 0 21 + 0 = 18 + -6x + 6x 21 = 18 + -6x + 6x Combine like terms: -6x + 6x = 0 21 = 18 + 0 21 = 18 Solving 21 = 18 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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