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Simplifying 7 + -3 = r + -4(2 + r) Combine like terms: 7 + -3 = 4 4 = r + -4(2 + r) 4 = r + (2 * -4 + r * -4) 4 = r + (-8 + -4r) Reorder the terms: 4 = -8 + r + -4r Combine like terms: r + -4r = -3r 4 = -8 + -3r Solving 4 = -8 + -3r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '3r' to each side of the equation. 4 + 3r = -8 + -3r + 3r Combine like terms: -3r + 3r = 0 4 + 3r = -8 + 0 4 + 3r = -8 Add '-4' to each side of the equation. 4 + -4 + 3r = -8 + -4 Combine like terms: 4 + -4 = 0 0 + 3r = -8 + -4 3r = -8 + -4 Combine like terms: -8 + -4 = -12 3r = -12 Divide each side by '3'. r = -4 Simplifying r = -4
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