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Simplifying 4(4) = r(-4) Multiply 4 * 4 16 = r(-4) Reorder the terms for easier multiplication: 16 = -4r Solving 16 = -4r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '4r' to each side of the equation. 16 + 4r = -4r + 4r Combine like terms: -4r + 4r = 0 16 + 4r = 0 Add '-16' to each side of the equation. 16 + -16 + 4r = 0 + -16 Combine like terms: 16 + -16 = 0 0 + 4r = 0 + -16 4r = 0 + -16 Combine like terms: 0 + -16 = -16 4r = -16 Divide each side by '4'. r = -4 Simplifying r = -4
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