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Simplifying 7(-3 + -5r) = -21 + -4r (-3 * 7 + -5r * 7) = -21 + -4r (-21 + -35r) = -21 + -4r Add '21' to each side of the equation. -21 + 21 + -35r = -21 + 21 + -4r Combine like terms: -21 + 21 = 0 0 + -35r = -21 + 21 + -4r -35r = -21 + 21 + -4r Combine like terms: -21 + 21 = 0 -35r = 0 + -4r -35r = -4r Solving -35r = -4r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '4r' to each side of the equation. -35r + 4r = -4r + 4r Combine like terms: -35r + 4r = -31r -31r = -4r + 4r Combine like terms: -4r + 4r = 0 -31r = 0 Divide each side by '-31'. r = 0 Simplifying r = 0
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