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Simplifying -25 + -5r = -5(5 + 7r) + -1r -25 + -5r = (5 * -5 + 7r * -5) + -1r -25 + -5r = (-25 + -35r) + -1r Combine like terms: -35r + -1r = -36r -25 + -5r = -25 + -36r Add '25' to each side of the equation. -25 + 25 + -5r = -25 + 25 + -36r Combine like terms: -25 + 25 = 0 0 + -5r = -25 + 25 + -36r -5r = -25 + 25 + -36r Combine like terms: -25 + 25 = 0 -5r = 0 + -36r -5r = -36r Solving -5r = -36r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '36r' to each side of the equation. -5r + 36r = -36r + 36r Combine like terms: -5r + 36r = 31r 31r = -36r + 36r Combine like terms: -36r + 36r = 0 31r = 0 Divide each side by '31'. r = 0 Simplifying r = 0
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