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Simplifying 10 = r + 4 + -3r Reorder the terms: 10 = 4 + r + -3r Combine like terms: r + -3r = -2r 10 = 4 + -2r Solving 10 = 4 + -2r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '2r' to each side of the equation. 10 + 2r = 4 + -2r + 2r Combine like terms: -2r + 2r = 0 10 + 2r = 4 + 0 10 + 2r = 4 Add '-10' to each side of the equation. 10 + -10 + 2r = 4 + -10 Combine like terms: 10 + -10 = 0 0 + 2r = 4 + -10 2r = 4 + -10 Combine like terms: 4 + -10 = -6 2r = -6 Divide each side by '2'. r = -3 Simplifying r = -3
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