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Simplifying 6(3r + -2) + -6 = -90 Reorder the terms: 6(-2 + 3r) + -6 = -90 (-2 * 6 + 3r * 6) + -6 = -90 (-12 + 18r) + -6 = -90 Reorder the terms: -12 + -6 + 18r = -90 Combine like terms: -12 + -6 = -18 -18 + 18r = -90 Solving -18 + 18r = -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 + 18r = -90 + 18 Combine like terms: -18 + 18 = 0 0 + 18r = -90 + 18 18r = -90 + 18 Combine like terms: -90 + 18 = -72 18r = -72 Divide each side by '18'. r = -4 Simplifying r = -4
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