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Simplifying -130 = 10(-3 + r) -130 = (-3 * 10 + r * 10) -130 = (-30 + 10r) Solving -130 = -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. -130 + -10r = -30 + 10r + -10r Combine like terms: 10r + -10r = 0 -130 + -10r = -30 + 0 -130 + -10r = -30 Add '130' to each side of the equation. -130 + 130 + -10r = -30 + 130 Combine like terms: -130 + 130 = 0 0 + -10r = -30 + 130 -10r = -30 + 130 Combine like terms: -30 + 130 = 100 -10r = 100 Divide each side by '-10'. r = -10 Simplifying r = -10
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