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Simplifying -8 + -7(r + -6) = 90 Reorder the terms: -8 + -7(-6 + r) = 90 -8 + (-6 * -7 + r * -7) = 90 -8 + (42 + -7r) = 90 Combine like terms: -8 + 42 = 34 34 + -7r = 90 Solving 34 + -7r = 90 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-34' to each side of the equation. 34 + -34 + -7r = 90 + -34 Combine like terms: 34 + -34 = 0 0 + -7r = 90 + -34 -7r = 90 + -34 Combine like terms: 90 + -34 = 56 -7r = 56 Divide each side by '-7'. r = -8 Simplifying r = -8
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