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Simplifying 7r + -6(2 + -2r) = 140 7r + (2 * -6 + -2r * -6) = 140 7r + (-12 + 12r) = 140 Reorder the terms: -12 + 7r + 12r = 140 Combine like terms: 7r + 12r = 19r -12 + 19r = 140 Solving -12 + 19r = 140 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + 19r = 140 + 12 Combine like terms: -12 + 12 = 0 0 + 19r = 140 + 12 19r = 140 + 12 Combine like terms: 140 + 12 = 152 19r = 152 Divide each side by '19'. r = 8 Simplifying r = 8
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