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Simplifying (-1.6r) + 5 = (-7.8) Reorder the terms: 5 + (-1.6r) = (-7.8) 5 + (-1.6r) = -7.8 Solving 5 + (-1.6r) = -7.8 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + (-1.6r) = -7.8 + -5 Combine like terms: 5 + -5 = 0 0 + (-1.6r) = -7.8 + -5 (-1.6r) = -7.8 + -5 Combine like terms: -7.8 + -5 = -12.8 (-1.6r) = -12.8 Divide each side by '-1.6'. r = 8 Simplifying r = 8
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