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Simplifying -4 = -12 + r Solving -4 = -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. -4 + -1r = -12 + r + -1r Combine like terms: r + -1r = 0 -4 + -1r = -12 + 0 -4 + -1r = -12 Add '4' to each side of the equation. -4 + 4 + -1r = -12 + 4 Combine like terms: -4 + 4 = 0 0 + -1r = -12 + 4 -1r = -12 + 4 Combine like terms: -12 + 4 = -8 -1r = -8 Divide each side by '-1'. r = 8 Simplifying r = 8
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