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Simplifying -30 = 3(-5r) Remove parenthesis around (-5r) -30 = 3 * -5r Multiply 3 * -5 -30 = -15r Solving -30 = -15r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '15r' to each side of the equation. -30 + 15r = -15r + 15r Combine like terms: -15r + 15r = 0 -30 + 15r = 0 Add '30' to each side of the equation. -30 + 30 + 15r = 0 + 30 Combine like terms: -30 + 30 = 0 0 + 15r = 0 + 30 15r = 0 + 30 Combine like terms: 0 + 30 = 30 15r = 30 Divide each side by '15'. r = 2 Simplifying r = 2
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