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Simplifying 42 = -7(r + -6) Reorder the terms: 42 = -7(-6 + r) 42 = (-6 * -7 + r * -7) 42 = (42 + -7r) Add '-42' to each side of the equation. 42 + -42 = 42 + -42 + -7r Combine like terms: 42 + -42 = 0 0 = 42 + -42 + -7r Combine like terms: 42 + -42 = 0 0 = 0 + -7r 0 = -7r Solving 0 = -7r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '7r' to each side of the equation. 0 + 7r = -7r + 7r Remove the zero: 7r = -7r + 7r Combine like terms: -7r + 7r = 0 7r = 0 Divide each side by '7'. r = 0 Simplifying r = 0
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