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Simplifying -3(r + -7) + -3(5r + 4) + -15r = 0 Reorder the terms: -3(-7 + r) + -3(5r + 4) + -15r = 0 (-7 * -3 + r * -3) + -3(5r + 4) + -15r = 0 (21 + -3r) + -3(5r + 4) + -15r = 0 Reorder the terms: 21 + -3r + -3(4 + 5r) + -15r = 0 21 + -3r + (4 * -3 + 5r * -3) + -15r = 0 21 + -3r + (-12 + -15r) + -15r = 0 Reorder the terms: 21 + -12 + -3r + -15r + -15r = 0 Combine like terms: 21 + -12 = 9 9 + -3r + -15r + -15r = 0 Combine like terms: -3r + -15r = -18r 9 + -18r + -15r = 0 Combine like terms: -18r + -15r = -33r 9 + -33r = 0 Solving 9 + -33r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + -33r = 0 + -9 Combine like terms: 9 + -9 = 0 0 + -33r = 0 + -9 -33r = 0 + -9 Combine like terms: 0 + -9 = -9 -33r = -9 Divide each side by '-33'. r = 0.2727272727 Simplifying r = 0.2727272727
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