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Simplifying 4 = 2(r + -4) Reorder the terms: 4 = 2(-4 + r) 4 = (-4 * 2 + r * 2) 4 = (-8 + 2r) Solving 4 = -8 + 2r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2r' to each side of the equation. 4 + -2r = -8 + 2r + -2r Combine like terms: 2r + -2r = 0 4 + -2r = -8 + 0 4 + -2r = -8 Add '-4' to each side of the equation. 4 + -4 + -2r = -8 + -4 Combine like terms: 4 + -4 = 0 0 + -2r = -8 + -4 -2r = -8 + -4 Combine like terms: -8 + -4 = -12 -2r = -12 Divide each side by '-2'. r = 6 Simplifying r = 6
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