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Simplifying 40 = -10r + -30 Reorder the terms: 40 = -30 + -10r Solving 40 = -30 + -10r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '10r' to each side of the equation. 40 + 10r = -30 + -10r + 10r Combine like terms: -10r + 10r = 0 40 + 10r = -30 + 0 40 + 10r = -30 Add '-40' to each side of the equation. 40 + -40 + 10r = -30 + -40 Combine like terms: 40 + -40 = 0 0 + 10r = -30 + -40 10r = -30 + -40 Combine like terms: -30 + -40 = -70 10r = -70 Divide each side by '10'. r = -7 Simplifying r = -7
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