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Simplifying 13 + -20r = -19 + -16r Solving 13 + -20r = -19 + -16r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '16r' to each side of the equation. 13 + -20r + 16r = -19 + -16r + 16r Combine like terms: -20r + 16r = -4r 13 + -4r = -19 + -16r + 16r Combine like terms: -16r + 16r = 0 13 + -4r = -19 + 0 13 + -4r = -19 Add '-13' to each side of the equation. 13 + -13 + -4r = -19 + -13 Combine like terms: 13 + -13 = 0 0 + -4r = -19 + -13 -4r = -19 + -13 Combine like terms: -19 + -13 = -32 -4r = -32 Divide each side by '-4'. r = 8 Simplifying r = 8
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