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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 = 160 10r = 160 Divide each side by '10'. r = 16 Simplifying r = 16
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