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Simplifying 18r = -3(r + -7) Reorder the terms: 18r = -3(-7 + r) 18r = (-7 * -3 + r * -3) 18r = (21 + -3r) Solving 18r = 21 + -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. 18r + 3r = 21 + -3r + 3r Combine like terms: 18r + 3r = 21r 21r = 21 + -3r + 3r Combine like terms: -3r + 3r = 0 21r = 21 + 0 21r = 21 Divide each side by '21'. r = 1 Simplifying r = 1
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