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Simplifying 100 = 4 + -2r Solving 100 = 4 + -2r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '2r' to each side of the equation. 100 + 2r = 4 + -2r + 2r Combine like terms: -2r + 2r = 0 100 + 2r = 4 + 0 100 + 2r = 4 Add '-100' to each side of the equation. 100 + -100 + 2r = 4 + -100 Combine like terms: 100 + -100 = 0 0 + 2r = 4 + -100 2r = 4 + -100 Combine like terms: 4 + -100 = -96 2r = -96 Divide each side by '2'. r = -48 Simplifying r = -48
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