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Simplifying 140 = 7(6 + -2r) 140 = (6 * 7 + -2r * 7) 140 = (42 + -14r) Solving 140 = 42 + -14r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '14r' to each side of the equation. 140 + 14r = 42 + -14r + 14r Combine like terms: -14r + 14r = 0 140 + 14r = 42 + 0 140 + 14r = 42 Add '-140' to each side of the equation. 140 + -140 + 14r = 42 + -140 Combine like terms: 140 + -140 = 0 0 + 14r = 42 + -140 14r = 42 + -140 Combine like terms: 42 + -140 = -98 14r = -98 Divide each side by '14'. r = -7 Simplifying r = -7
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