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Simplifying -1(1 + -7r) + -1r = 6(r + -3) (1 * -1 + -7r * -1) + -1r = 6(r + -3) (-1 + 7r) + -1r = 6(r + -3) Combine like terms: 7r + -1r = 6r -1 + 6r = 6(r + -3) Reorder the terms: -1 + 6r = 6(-3 + r) -1 + 6r = (-3 * 6 + r * 6) -1 + 6r = (-18 + 6r) Add '-6r' to each side of the equation. -1 + 6r + -6r = -18 + 6r + -6r Combine like terms: 6r + -6r = 0 -1 + 0 = -18 + 6r + -6r -1 = -18 + 6r + -6r Combine like terms: 6r + -6r = 0 -1 = -18 + 0 -1 = -18 Solving -1 = -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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