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Simplifying r + -4(2 + r) = 7 + -3r r + (2 * -4 + r * -4) = 7 + -3r r + (-8 + -4r) = 7 + -3r Reorder the terms: -8 + r + -4r = 7 + -3r Combine like terms: r + -4r = -3r -8 + -3r = 7 + -3r Add '3r' to each side of the equation. -8 + -3r + 3r = 7 + -3r + 3r Combine like terms: -3r + 3r = 0 -8 + 0 = 7 + -3r + 3r -8 = 7 + -3r + 3r Combine like terms: -3r + 3r = 0 -8 = 7 + 0 -8 = 7 Solving -8 = 7 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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