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