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Simplifying 4 + -1r = (-5) 4 + -1r = -5 Solving 4 + -1r = -5 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -1r = -5 + -4 Combine like terms: 4 + -4 = 0 0 + -1r = -5 + -4 -1r = -5 + -4 Combine like terms: -5 + -4 = -9 -1r = -9 Divide each side by '-1'. r = 9 Simplifying r = 9
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