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Simplifying -3(2r + -6) + -6r = 90 Reorder the terms: -3(-6 + 2r) + -6r = 90 (-6 * -3 + 2r * -3) + -6r = 90 (18 + -6r) + -6r = 90 Combine like terms: -6r + -6r = -12r 18 + -12r = 90 Solving 18 + -12r = 90 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + -12r = 90 + -18 Combine like terms: 18 + -18 = 0 0 + -12r = 90 + -18 -12r = 90 + -18 Combine like terms: 90 + -18 = 72 -12r = 72 Divide each side by '-12'. r = -6 Simplifying r = -6
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