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Simplifying 7 + -3r = r + -1(2 + r) 7 + -3r = r + (2 * -1 + r * -1) 7 + -3r = r + (-2 + -1r) Reorder the terms: 7 + -3r = -2 + r + -1r Combine like terms: r + -1r = 0 7 + -3r = -2 + 0 7 + -3r = -2 Solving 7 + -3r = -2 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -3r = -2 + -7 Combine like terms: 7 + -7 = 0 0 + -3r = -2 + -7 -3r = -2 + -7 Combine like terms: -2 + -7 = -9 -3r = -9 Divide each side by '-3'. r = 3 Simplifying r = 3
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