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Simplifying 2r + -7 = -12 + r Reorder the terms: -7 + 2r = -12 + r Solving -7 + 2r = -12 + 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. -7 + 2r + -1r = -12 + r + -1r Combine like terms: 2r + -1r = 1r -7 + 1r = -12 + r + -1r Combine like terms: r + -1r = 0 -7 + 1r = -12 + 0 -7 + 1r = -12 Add '7' to each side of the equation. -7 + 7 + 1r = -12 + 7 Combine like terms: -7 + 7 = 0 0 + 1r = -12 + 7 1r = -12 + 7 Combine like terms: -12 + 7 = -5 1r = -5 Divide each side by '1'. r = -5 Simplifying r = -5
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