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Simplifying 7r + -9r + 4 = 10 Reorder the terms: 4 + 7r + -9r = 10 Combine like terms: 7r + -9r = -2r 4 + -2r = 10 Solving 4 + -2r = 10 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -2r = 10 + -4 Combine like terms: 4 + -4 = 0 0 + -2r = 10 + -4 -2r = 10 + -4 Combine like terms: 10 + -4 = 6 -2r = 6 Divide each side by '-2'. r = -3 Simplifying r = -3
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