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Simplifying 100 = r + -30 Reorder the terms: 100 = -30 + r Solving 100 = -30 + 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. 100 + -1r = -30 + r + -1r Combine like terms: r + -1r = 0 100 + -1r = -30 + 0 100 + -1r = -30 Add '-100' to each side of the equation. 100 + -100 + -1r = -30 + -100 Combine like terms: 100 + -100 = 0 0 + -1r = -30 + -100 -1r = -30 + -100 Combine like terms: -30 + -100 = -130 -1r = -130 Divide each side by '-1'. r = 130 Simplifying r = 130
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