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Simplifying -66 = r + -1(-74) Multiply -1 * -74 -66 = r + 74 Reorder the terms: -66 = 74 + r Solving -66 = 74 + 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. -66 + -1r = 74 + r + -1r Combine like terms: r + -1r = 0 -66 + -1r = 74 + 0 -66 + -1r = 74 Add '66' to each side of the equation. -66 + 66 + -1r = 74 + 66 Combine like terms: -66 + 66 = 0 0 + -1r = 74 + 66 -1r = 74 + 66 Combine like terms: 74 + 66 = 140 -1r = 140 Divide each side by '-1'. r = -140 Simplifying r = -140
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