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Simplifying r + 7 + -3r = -11 Reorder the terms: 7 + r + -3r = -11 Combine like terms: r + -3r = -2r 7 + -2r = -11 Solving 7 + -2r = -11 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 + -2r = -11 + -7 Combine like terms: 7 + -7 = 0 0 + -2r = -11 + -7 -2r = -11 + -7 Combine like terms: -11 + -7 = -18 -2r = -18 Divide each side by '-2'. r = 9 Simplifying r = 9
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