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Simplifying -98 = 3 + 7(6 + -3r) -98 = 3 + (6 * 7 + -3r * 7) -98 = 3 + (42 + -21r) Combine like terms: 3 + 42 = 45 -98 = 45 + -21r Solving -98 = 45 + -21r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '21r' to each side of the equation. -98 + 21r = 45 + -21r + 21r Combine like terms: -21r + 21r = 0 -98 + 21r = 45 + 0 -98 + 21r = 45 Add '98' to each side of the equation. -98 + 98 + 21r = 45 + 98 Combine like terms: -98 + 98 = 0 0 + 21r = 45 + 98 21r = 45 + 98 Combine like terms: 45 + 98 = 143 21r = 143 Divide each side by '21'. r = 6.80952381 Simplifying r = 6.80952381
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