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Simplifying 2 + -20r = -4r + 7 + -15r Reorder the terms: 2 + -20r = 7 + -4r + -15r Combine like terms: -4r + -15r = -19r 2 + -20r = 7 + -19r Solving 2 + -20r = 7 + -19r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '19r' to each side of the equation. 2 + -20r + 19r = 7 + -19r + 19r Combine like terms: -20r + 19r = -1r 2 + -1r = 7 + -19r + 19r Combine like terms: -19r + 19r = 0 2 + -1r = 7 + 0 2 + -1r = 7 Add '-2' to each side of the equation. 2 + -2 + -1r = 7 + -2 Combine like terms: 2 + -2 = 0 0 + -1r = 7 + -2 -1r = 7 + -2 Combine like terms: 7 + -2 = 5 -1r = 5 Divide each side by '-1'. r = -5 Simplifying r = -5
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