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Simplifying 7 + -3r = r + -4(5 + r) 7 + -3r = r + (5 * -4 + r * -4) 7 + -3r = r + (-20 + -4r) Reorder the terms: 7 + -3r = -20 + r + -4r Combine like terms: r + -4r = -3r 7 + -3r = -20 + -3r Add '3r' to each side of the equation. 7 + -3r + 3r = -20 + -3r + 3r Combine like terms: -3r + 3r = 0 7 + 0 = -20 + -3r + 3r 7 = -20 + -3r + 3r Combine like terms: -3r + 3r = 0 7 = -20 + 0 7 = -20 Solving 7 = -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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