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Simplifying 100 = 4 + -12r Solving 100 = 4 + -12r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '12r' to each side of the equation. 100 + 12r = 4 + -12r + 12r Combine like terms: -12r + 12r = 0 100 + 12r = 4 + 0 100 + 12r = 4 Add '-100' to each side of the equation. 100 + -100 + 12r = 4 + -100 Combine like terms: 100 + -100 = 0 0 + 12r = 4 + -100 12r = 4 + -100 Combine like terms: 4 + -100 = -96 12r = -96 Divide each side by '12'. r = -8 Simplifying r = -8
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