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Simplifying -10(9r + 7) = 0 Reorder the terms: -10(7 + 9r) = 0 (7 * -10 + 9r * -10) = 0 (-70 + -90r) = 0 Solving -70 + -90r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '70' to each side of the equation. -70 + 70 + -90r = 0 + 70 Combine like terms: -70 + 70 = 0 0 + -90r = 0 + 70 -90r = 0 + 70 Combine like terms: 0 + 70 = 70 -90r = 70 Divide each side by '-90'. r = -0.7777777778 Simplifying r = -0.7777777778
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