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Simplifying 15r + -4(-7) + -72 = 3r Multiply -4 * -7 15r + 28 + -72 = 3r Reorder the terms: 28 + -72 + 15r = 3r Combine like terms: 28 + -72 = -44 -44 + 15r = 3r Solving -44 + 15r = 3r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3r' to each side of the equation. -44 + 15r + -3r = 3r + -3r Combine like terms: 15r + -3r = 12r -44 + 12r = 3r + -3r Combine like terms: 3r + -3r = 0 -44 + 12r = 0 Add '44' to each side of the equation. -44 + 44 + 12r = 0 + 44 Combine like terms: -44 + 44 = 0 0 + 12r = 0 + 44 12r = 0 + 44 Combine like terms: 0 + 44 = 44 12r = 44 Divide each side by '12'. r = 3.666666667 Simplifying r = 3.666666667
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