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Simplifying -2(2r + -5) = -37 + 7 Reorder the terms: -2(-5 + 2r) = -37 + 7 (-5 * -2 + 2r * -2) = -37 + 7 (10 + -4r) = -37 + 7 Combine like terms: -37 + 7 = -30 10 + -4r = -30 Solving 10 + -4r = -30 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + -4r = -30 + -10 Combine like terms: 10 + -10 = 0 0 + -4r = -30 + -10 -4r = -30 + -10 Combine like terms: -30 + -10 = -40 -4r = -40 Divide each side by '-4'. r = 10 Simplifying r = 10
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