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Simplifying 3(4r + -7) = 7r + -36 Reorder the terms: 3(-7 + 4r) = 7r + -36 (-7 * 3 + 4r * 3) = 7r + -36 (-21 + 12r) = 7r + -36 Reorder the terms: -21 + 12r = -36 + 7r Solving -21 + 12r = -36 + 7r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-7r' to each side of the equation. -21 + 12r + -7r = -36 + 7r + -7r Combine like terms: 12r + -7r = 5r -21 + 5r = -36 + 7r + -7r Combine like terms: 7r + -7r = 0 -21 + 5r = -36 + 0 -21 + 5r = -36 Add '21' to each side of the equation. -21 + 21 + 5r = -36 + 21 Combine like terms: -21 + 21 = 0 0 + 5r = -36 + 21 5r = -36 + 21 Combine like terms: -36 + 21 = -15 5r = -15 Divide each side by '5'. r = -3 Simplifying r = -3
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