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Simplifying -7(r + -3) = 15 + -7r Reorder the terms: -7(-3 + r) = 15 + -7r (-3 * -7 + r * -7) = 15 + -7r (21 + -7r) = 15 + -7r Add '7r' to each side of the equation. 21 + -7r + 7r = 15 + -7r + 7r Combine like terms: -7r + 7r = 0 21 + 0 = 15 + -7r + 7r 21 = 15 + -7r + 7r Combine like terms: -7r + 7r = 0 21 = 15 + 0 21 = 15 Solving 21 = 15 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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