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Simplifying 9(r + -80) = 90 Reorder the terms: 9(-80 + r) = 90 (-80 * 9 + r * 9) = 90 (-720 + 9r) = 90 Solving -720 + 9r = 90 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '720' to each side of the equation. -720 + 720 + 9r = 90 + 720 Combine like terms: -720 + 720 = 0 0 + 9r = 90 + 720 9r = 90 + 720 Combine like terms: 90 + 720 = 810 9r = 810 Divide each side by '9'. r = 90 Simplifying r = 90
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