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Simplifying 7 = -12r + -1(-1) Multiply -1 * -1 7 = -12r + 1 Reorder the terms: 7 = 1 + -12r Solving 7 = 1 + -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. 7 + 12r = 1 + -12r + 12r Combine like terms: -12r + 12r = 0 7 + 12r = 1 + 0 7 + 12r = 1 Add '-7' to each side of the equation. 7 + -7 + 12r = 1 + -7 Combine like terms: 7 + -7 = 0 0 + 12r = 1 + -7 12r = 1 + -7 Combine like terms: 1 + -7 = -6 12r = -6 Divide each side by '12'. r = -0.5 Simplifying r = -0.5
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