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Simplifying -4(r + 10) = -8 Reorder the terms: -4(10 + r) = -8 (10 * -4 + r * -4) = -8 (-40 + -4r) = -8 Solving -40 + -4r = -8 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '40' to each side of the equation. -40 + 40 + -4r = -8 + 40 Combine like terms: -40 + 40 = 0 0 + -4r = -8 + 40 -4r = -8 + 40 Combine like terms: -8 + 40 = 32 -4r = 32 Divide each side by '-4'. r = -8 Simplifying r = -8
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