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Simplifying 3(x + -7) = -20 + 3x Reorder the terms: 3(-7 + x) = -20 + 3x (-7 * 3 + x * 3) = -20 + 3x (-21 + 3x) = -20 + 3x Add '-3x' to each side of the equation. -21 + 3x + -3x = -20 + 3x + -3x Combine like terms: 3x + -3x = 0 -21 + 0 = -20 + 3x + -3x -21 = -20 + 3x + -3x Combine like terms: 3x + -3x = 0 -21 = -20 + 0 -21 = -20 Solving -21 = -20 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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