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Simplifying -20 + -7r = 5(r + -4) Reorder the terms: -20 + -7r = 5(-4 + r) -20 + -7r = (-4 * 5 + r * 5) -20 + -7r = (-20 + 5r) Add '20' to each side of the equation. -20 + 20 + -7r = -20 + 20 + 5r Combine like terms: -20 + 20 = 0 0 + -7r = -20 + 20 + 5r -7r = -20 + 20 + 5r Combine like terms: -20 + 20 = 0 -7r = 0 + 5r -7r = 5r Solving -7r = 5r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-5r' to each side of the equation. -7r + -5r = 5r + -5r Combine like terms: -7r + -5r = -12r -12r = 5r + -5r Combine like terms: 5r + -5r = 0 -12r = 0 Divide each side by '-12'. r = 0 Simplifying r = 0
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