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Simplifying 13x + -1(x + -7) = 12x + -13 Reorder the terms: 13x + -1(-7 + x) = 12x + -13 13x + (-7 * -1 + x * -1) = 12x + -13 13x + (7 + -1x) = 12x + -13 Reorder the terms: 7 + 13x + -1x = 12x + -13 Combine like terms: 13x + -1x = 12x 7 + 12x = 12x + -13 Reorder the terms: 7 + 12x = -13 + 12x Add '-12x' to each side of the equation. 7 + 12x + -12x = -13 + 12x + -12x Combine like terms: 12x + -12x = 0 7 + 0 = -13 + 12x + -12x 7 = -13 + 12x + -12x Combine like terms: 12x + -12x = 0 7 = -13 + 0 7 = -13 Solving 7 = -13 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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