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Simplifying 90 = 6(-3 + r) 90 = (-3 * 6 + r * 6) 90 = (-18 + 6r) Solving 90 = -18 + 6r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-6r' to each side of the equation. 90 + -6r = -18 + 6r + -6r Combine like terms: 6r + -6r = 0 90 + -6r = -18 + 0 90 + -6r = -18 Add '-90' to each side of the equation. 90 + -90 + -6r = -18 + -90 Combine like terms: 90 + -90 = 0 0 + -6r = -18 + -90 -6r = -18 + -90 Combine like terms: -18 + -90 = -108 -6r = -108 Divide each side by '-6'. r = 18 Simplifying r = 18
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