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Simplifying -10 + 13r = 20 + 15r Solving -10 + 13r = 20 + 15r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-15r' to each side of the equation. -10 + 13r + -15r = 20 + 15r + -15r Combine like terms: 13r + -15r = -2r -10 + -2r = 20 + 15r + -15r Combine like terms: 15r + -15r = 0 -10 + -2r = 20 + 0 -10 + -2r = 20 Add '10' to each side of the equation. -10 + 10 + -2r = 20 + 10 Combine like terms: -10 + 10 = 0 0 + -2r = 20 + 10 -2r = 20 + 10 Combine like terms: 20 + 10 = 30 -2r = 30 Divide each side by '-2'. r = -15 Simplifying r = -15
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